What size pond pump do I need?

Choosing what size of pond pump to run your filtration systems is one of the most important things to consider when setting up your pond, and at Swell UK it’s something we get asked about a lot.

Putting aside makes and models for the time being, the first thing you need to establish is what flow rate you are going to require to run the filtration systems in your pond. This primarily comes down to the volume of water than needs to be circulated in your water.

A healthy pond with an adequate filtration system circulates the entire volume of the pond roughly once every hour. Therefore, if your community fish pond (with no Koi) has a capacity of around 5000L, you need a pump with a flow rate of 5000 litres per hour (lph), meaning that if set up correctly, all your water gets a good clean every 60 minutes.

Balancing your pond filter and pump

The next thing you need to think about is your pond filter itself – after all, the purpose of your pump is to supply your filter with water to be cleaned, so they need to be matched as perfectly as possible. In non-koi ponds, try to keep this formula in mind:

Size of pond = flow rate of pond pump = capacity of filter

Eg. 5000L pond = 5000 lph flow rated pump = 5000l flow rate capacity filter

Simple really!

When koi get involved however, things get a little more complicated.

A normally stocked koi pond creates a considerably larger amount of organic waste than a similar sized pond with goldfish in. Koi by their nature need a lot of nutrients to sustain their beautiful bodies, and therefore also excrete more matter – around 4 times as much as normal pond fish, and this needs to be accounted for by your filtration system in order to keep the water healthy.

Talk to your koi stockist on purchase to point you in the direction of a filter system that will handle that volume of koi stocked water, and then match the flow rate capacity to that.

Balancing pond size and filtration systems.

Going back to our formula, you can easily see how if things are unbalanced, disaster can strike:

Eg. 5000L pond + 10000Lph pump + 5000L filter box = very little water in your pond, and an overflowing filter box, and a very soggy garden!

You can see in the example above that the pump is way too powerful for the size of pond, and the obvious problems will occur. Similarly:

Eg. 5000L pond, + 2000lph pump + 5000L filter box = a low pressured filtration system that is less effective and does not clean as much water

The best type of pond pump for you

As a general rule of thumb, with pond pumps, the price you pay is the quality you get, so broadly speaking the best one for you is the most expensive one you can afford. Despite this, there are a range of fantastic discount pond pumps entering the market as new models are created.

Something else to bare in mind is particulate. If your pond has a harsh, gravelly bottom or plenty of debris, think about getting a strainer cage or remote strainer for your pump. While most have a warrantee, the impellor is rarely covered due and is considered a perishable part by most manufacturers, so protecting your pond pump with adequate particulate straining is advised in most cases. Don’t forget to keep it clean with regular maintenance too! It won’t work too well if it is clogged with leaves and mud!


  • Rory Deynem Posted 07/10/2018 at 10:12 am | Permalink | Reply

    My pond is no more than 250litres. What’s the best pump and uv filter ?

  • Ron. Atherton Posted 06/10/2019 at 11:48 am | Permalink | Reply

    I have a 4 foot x 2 foot x 30 inch deep aquarium with a sump installed below the aquarium. What size pump would you recommend for this 125bgallon aquarium.

    • Jeremy Gay Posted 14/01/2020 at 1:33 pm | Permalink

      That’s a 540 litre aquarium so we would recommend a pump of 5000-6000lph. That will turn tank volume over ten times per hour.

  • Neil Pattison Posted 11/02/2020 at 3:04 pm | Permalink | Reply

    Hi, just building a pond and it’s approximate sizes are;

    L 4m x W 2.5 x D 1.5m. Could you advise what size pump / filter capacity I will need please?

    Many thanks

    • Jeremy Gay Posted 18/02/2020 at 9:58 am | Permalink

      Hi Neil,

      The pond will have a gross volume of 15,000 litres, so you’ll need a pond filter for 15,000 litres or more, and a pond pump that turns over a minimum of 7500lph in order to turn over the entire pond volume once every two hours. If you want clear water year round, include an Ultra violet clarifier that is suitable for ponds of 15,000lph. If you intend to keep koi, then halve manufacturers maximum volumes and select equipment for 30000 litres, for example.

  • Terry hughes Posted 18/02/2020 at 10:53 pm | Permalink | Reply

    My pond is 13 ft long x 8.6 ft wide x 5.8 deep what size pump and filter will I need please?

    • Jeremy Gay Posted 03/03/2020 at 9:32 am | Permalink

      Hi Terry, you have a gross volume of 17,000 litres (4000 gallons,)so you’ll need a filtration package (pump, filter and UV,) suitable for at least 20,000 litres. Note many manufacturers reduce the maximum volume their filter will cope with if you intend to keep koi. The pump should be around 8500lph, but the filter box should be the largest model that you can afford.

  • Gary Posted 01/03/2020 at 12:42 pm | Permalink | Reply

    Hi I have a 5400 litre pond with koi, currently running a oase5500 and a 8000 biosmart filtration , should I get a bigger pump ?

    • Jeremy Gay Posted 03/03/2020 at 9:25 am | Permalink

      On paper your pump is large enough, but if you do go for a larger model, ensure that your UVC and filter box are rated to handle the extra flow. If you still struggle to clear water even with a larger pump, you may need a larger filtration package all round.

  • robert vale Posted 05/03/2020 at 8:34 am | Permalink | Reply

    some advice please thinking of installing a 2.4 x 1.2 x 1.2 above ground pond best filter & pump please I have inherited 11 Koi all roughly 18ins in length

    • Jeremy Gay Posted 10/03/2020 at 9:02 am | Permalink

      Although the pond will be nice and deep at 1.2 metres, a 2.4 x 1.2m pond is on the small side for koi, especially 11 of them at 18″ in length! If you can go larger do so. By going 2.4 x 2.4 x 1.2 or 4.8 x 1.2 x 1.2 metres you will double the volume from 3456 litres gross volume to 6912 litres. If starting the pond from scratch consider going for a bottom drain, hard plumbing and a gravity fed koi filter. But this would need to be sited next to the pond and have the same water level. If you want something more discrete a pressure filter and solids handling pump is the answer but you’ll need the largest pressure filter model available as koi will clog it up quickly with their solid waste. Use an airpump and airstone at all times and add beneficial bacteria. By adding 11 large koi to a new pond you will risk a water quality disaster so arm yourself with a test kit and don’t feed them for a week before and after introducing them to lessen the strain on the biological filter.

  • Dave Posted 06/03/2020 at 8:00 am | Permalink | Reply

    Hi, I have a 10ft L x 6ft W x 5ft D pond currently being built in my garden, which i intend to have stocked with Koi. I have purchased a Auto Clean PFC-50000 Pressurised Pond Filter Kit With AquaECO 12000 Low Wattage Pond Pump. Have I gone too big with my filtration equipment?

    • Jeremy Gay Posted 10/03/2020 at 9:11 am | Permalink

      You can’t go too big when it comes to koi filtration. Your pond has a gross volume of 8500 litres so your filter, pump and UV should cope no problem. The test will be if the package can maintain clear water free of fines and unicellular algae, and water tests remain at zero ppm for ammonia and nitrite. If it can, its coping, and the right size for your koi pond.

  • Andrew hirst Posted 17/03/2020 at 7:56 pm | Permalink | Reply

    Hi I’m going to build a new pond, 12ft x 8ft x 4ft. I have an aqua eco pond pump 16000 ltrs hr is this pump too powerful for the pond.

    • Jeremy Gay Posted 31/03/2020 at 9:42 am | Permalink

      Your pond has a gross volume of 10896 litres so if the pump is running at full power and with minimum head loss (i.e it’s not having to pump the water very high up,) it’s too powerful for your pond volume. The issue that you may have is that it will pump too much water into the filter, which needs a slower flow to catch particles, and the UV, which again needs slower flow to zap green water. If the pump is controllable turn it down to about 35% power, which will also save you energy. If the pump cannot be turned down consider splitting the flow and sending half of it to a waterfall, half of it to another filter and UV, or buying a new, smaller pump altogether. If you can’t do any of those things you’ll have to match your filter and UV to the pump output if they are to guarantee clear water.

  • Steven Roberts Posted 27/03/2020 at 8:28 am | Permalink | Reply

    Hi please can you help. My pond is 7feetx4feet and 1.5 feet deep.


    • Jeremy Gay Posted 31/03/2020 at 10:09 am | Permalink

      Hi your pond has a volume of 1192 litres. Choose a 2500lph pump, or a complete filtration package consisting of pump, filter and UV for ponds up to 2500 litres.

  • Barry Posted 27/03/2020 at 6:34 pm | Permalink | Reply

    I have a pond that measures 4mts x 2mtrs 0.75mts deep what size pump do you recommend please?

    • Jeremy Gay Posted 31/03/2020 at 9:57 am | Permalink

      That pond has a gross volume of 6000 litres. Either select a complete pump, filter and UV system for ponds up to 7500 litres or select a pump which runs at about 3500lph, which will turn over your pond once every two hours. If you have koi then consider a much larger filter system, suitable for ponds up to 12,000 litres. (double pond volume)

  • Ant Posted 27/03/2020 at 11:56 pm | Permalink | Reply

    Hey glad I found this. I have a small pond 5x3x3 foot.
    Mix of 15 goldies, Shubunkins & comets + 3 ghost koi.
    Filtration always been very poor. I’ve ordered 12,000L/h pressurised, 10,000L/h pump due tomorrow. Will this be big enough?
    I also have 2 water features 3,500L/h & 1,400L/h.
    I’m wondering will I have way too much water flow?

    • Jeremy Gay Posted 31/03/2020 at 10:03 am | Permalink

      Your pond has a gross volume of 1277 litres, so that pump will turn over your pond seven times per hour. It may also be too much flow for your fish, which prefer more still water. Keep the filter but turn the flow right down if you can. Or maybe use the 3500lph pump to power the filter, then the water feature. Ghost koi will outgrow that pond size so consider finding them a much larger home long term.

  • rich Posted 30/03/2020 at 7:49 pm | Permalink | Reply

    I have a pond that holds about 8750 litres of water and hope that you could recommend a suitable pond pump and filter for it?
    Only have goldfish in it at the moment.

    • Jeremy Gay Posted 31/03/2020 at 10:16 am | Permalink

      Select a pump, filter and UV package for 9000 litres, or if you want to be on the safe side and your goldfish breed, or you add koi at a future date, 12,000 litres.

  • Rob Baker Posted 03/04/2020 at 7:52 am | Permalink | Reply

    Hi I have a 2700 liter raised pond could I use 2 3000 lph, 1 is a fountain filter 3000 lph the other is a pump and filter set with uv light and how many koi would you say is the maximum capacity for a 3000 litre pond. Thanks

    • Jeremy Gay Posted 07/04/2020 at 8:20 am | Permalink

      Hi the pond volume could do with being at least double that long term to accommodate the growth of koi. The filter turnover sounds ok for now but pond and filtration package should really be bigger for koi..

  • Mark Posted 03/04/2020 at 10:06 pm | Permalink | Reply

    Hi Jeremy, I am just enlarging our pond to 6m x 3 m x .8 m deep, it will have 2 waterfalls, I have at the moment 8000 lph pump running one waterfall plus a 12000 pressurised filter, would it be alright with the 12000 filter and a 10000 lph pump, gold fish orfes and ghost carps

    • Jeremy Gay Posted 07/04/2020 at 8:26 am | Permalink

      Hi your pond has a gross volume of 14,000 litres, so even at net volume the 12,000 pressure filter is right on its limit. It’s a good-sized pond, your orfe and ghost carp will quickly grow to two feet long in there and when they do you’ll need a bigger filter. You can keep the same pump though.

  • Chris mudge Posted 04/04/2020 at 1:15 am | Permalink | Reply

    Hi I have a pond 7ft x 4ft x2ft what pump and filter do I require
    Regards Chris

    • Jeremy Gay Posted 07/04/2020 at 8:28 am | Permalink

      Hi your pond has a gross volume of 1589 litres, so choose a pump, UV and pressurised filter package for 2500 litres. Don’t forget hose, hose clips and some bacteria to get the biological filter started.

  • Barry Posted 05/04/2020 at 4:35 pm | Permalink | Reply

    Thanks for that Jeremy, would an Olympus Pro 6500 pump that is on the Swell UK website be ok, as i’ve got a waterfall too?

    • Jeremy Gay Posted 07/04/2020 at 8:43 am | Permalink

      Hi yes, it would be suitable. Many thanks.

  • Steve Posted 06/04/2020 at 10:23 am | Permalink | Reply

    I have built a 7ft 4in x 5ft 4in x 3ft 10in / 2.3m x 1.65m x x1.2m pond which i want a mixture of koi and gold fish.
    Can you recommend a pressurised filter and pump.
    I am on a budget of £200 …..

    • Jeremy Gay Posted 07/04/2020 at 8:57 am | Permalink

      Hi the pond has a gross volume of 4500 litres so at a push you could opt for a filtration package for 4500 litres, but if you go for koi you really need a filtration package that can handle double that (9000 litres) there are some excellent value filtration packages here https://www.swelluk.com/pond/pond-filters-24/pump-and-filter-kits-319/

  • Barry Posted 07/04/2020 at 1:29 pm | Permalink | Reply

    Hi Jeremy, thanks for your advice on the size of pump i need for my pond, you said my pond is roughly 6000ltrs would the Olympus Pro 6500 be ok to power a waterfall as well?

    • Jeremy Gay Posted 07/04/2020 at 3:01 pm | Permalink

      Hi again, yes it could also power a waterfall no problem. Many thanks,

  • Barry Posted 07/04/2020 at 10:06 pm | Permalink | Reply

    Hi Jeremy, thanks for that, apologies, the reply didn’t come through until after i sent the question second time.

  • nigel hirst Posted 09/04/2020 at 12:32 pm | Permalink | Reply

    my pond is 450 gallons 2000lts i was thinking of gettinng a 8000lph pump and same filter is this over the top ??

    • Jeremy Gay Posted 14/04/2020 at 9:04 am | Permalink

      Hi there, yes, the pump is larger than it needs to be, but it depends on what you need it to do. To filter the pond or for a small fountain, 2500lph will be fine. Even if running a waterfall then 4000lph should be fine to accommodate head loss. 8000lph is over the top for a pond of that size, and far too powerful for a filter.

  • Tom Posted 10/04/2020 at 9:03 am | Permalink | Reply

    Hi Jeremy, Just in the process of building a small Koi pond, will work out to 4600 litres, Looking at getting a Pressurised Filter 8000 and a 4500 pond pump, will this do the trick?

    • Jeremy Gay Posted 14/04/2020 at 9:06 am | Permalink

      Hi Tom, yes that sounds good, as the frictional loss from from the pressure filter will cut flow down over time, especially as it starts to block. I’d go for it.

  • David Posted 12/04/2020 at 10:03 am | Permalink | Reply

    Hi Jeremy
    I have 110cm diameter round outdoor pond which is about 25cm deep and holds about 300 litres. In the middle is a 1m fountain. It has a few ordinary goldfish. What pump do you suggest so that I can get a decent fountain out the top (say 20cm)? Is 3500 lph sufficient?

    • Jeremy Gay Posted 14/04/2020 at 9:16 am | Permalink

      Hi David, yes, 3500lph sounds ok to me but you could do with the pump curves off the manufacturer to tell you how much water the pump will produce at 120cm of head. If the pump can still produce 1000lph at the top of your 1 metre fountain then you will be ok. Choose a fountain pump or feature pump over a filter pump, and preferably an adjustable one which can be turned down to get the output exactly right. Failing that install a tap/valve in the hose from pump to fountain so that you can turn it down manually and adjust it to to get it just right.

  • Tina Posted 12/04/2020 at 11:30 am | Permalink | Reply

    Hi Jeremy my very old pump has given up and I don’t have the original box to know what size it was. My pond is 7.5ft x 4ft x 1,75ft. Can you please help?

    • Jeremy Gay Posted 14/04/2020 at 9:22 am | Permalink

      Hi there your pond has a gross volume of 1490 litres. If I was going to choose a general pump to power a small watercourse, fountain or filter I would opt for one of around 2500lph. If I wanted to split that flow and maybe do two things like a fountain and filter or fountain and watercourse then I would opt for a model producing 3500lph. If you need a filter and UV too then choose a pump, pressurised filter and UV for ponds up to 2500 litres. Many thanks.

  • Steph Cawley Posted 12/04/2020 at 3:03 pm | Permalink | Reply

    Hi Jeremy,
    We have dug out our pond and the sizes are as follows:
    (L) 3.05m
    (W) 2.67m
    (D) 0.71m
    Would you be able to tell me what capacity of water this would hold please?
    Kind regards,

    • Jeremy Gay Posted 14/04/2020 at 9:25 am | Permalink

      Hi Steph your pond holds 5782 litres gross volume. Choose a filtration package for 6000 litres, or 12,000 litres if you want to keep koi. Many thanks.

  • Wayne mc Posted 13/04/2020 at 7:40 pm | Permalink | Reply

    Hi there I’ve got a pond roughly 600/700 liters and am unsure on what size pump/filter system to get as I would like to power a water fall too,, any ideas?

    • Jeremy Gay Posted 14/04/2020 at 9:30 am | Permalink

      Hi Wayne, you could opt for an all in one pump and filter which sits inside the pond. You’ll need one that pumps 2500lph in order to power a small watercourse. Better still would be a 2500lph pump in the pond, a pressure filter outside the pond, and then the outlet of the pressure filter feeding the water fall. This is assuming that the waterfall is only lifting a foot above the pond. If its a large or high waterfall then the pump will experience head loss and you may need to go bigger, but one of my ponds is small, with a small preformed watercourse, and a 2500lph is just fine.

  • Paul Posted 16/04/2020 at 11:17 am | Permalink | Reply

    Hi Jeremy I have a fish pond with 10,0000 L in it would A 20000 L bio pressure filter be any good pls

    • Jeremy Gay Posted 21/04/2020 at 9:13 am | Permalink

      Hi Paul,

      If you have koi that pressure filter may be on its limit, as although its rated for up to 20,000 litres, you tend to halve it for fish and halve it again for koi. That’s a big pond so start with that and see how you get on. You can always add another pressure filter or a box filter, if you need it.

  • Zoe Frost Posted 16/04/2020 at 5:08 pm | Permalink | Reply

    Hi, we have dug a pond that is 1m deep by 2 m long but 1m wide, although the sides are graduated so not exactly sure of volume, planning on a small waterfall. What size pump and filter are required please? Any options for solar powered?

    • Jeremy Gay Posted 21/04/2020 at 9:27 am | Permalink

      Work on a volume of 2000 litres, even though the actual net volume will be quite a bit less than that. There are options for solar fountain pumps but not filter sets, as a filter needs guaranteed flow 24/7. You could opt for a single pump, filter and UV in one, like the Swell in pond UVC 2500, and run a hose off that to the waterfall, or better still opt for a pump, pressurised filter and UVC like the Oase Biopress Set 4000.

  • Sam England Posted 17/04/2020 at 1:48 pm | Permalink | Reply

    Hi, I am building the following pond:

    Length: 5.5m
    Width: 1.7m
    Depth: 0.9 (3 foot)

    I am unsure if I will have goldfish and koi. but would like the option, with this in mind, could you tell me what LPH I would need, and potentially recommend any gravity fed filter system for my pond (bottom drain with 4 inch pipe to be installed) around £250 please?

    Thanks, Sam.

    • Jeremy Gay Posted 21/04/2020 at 9:35 am | Permalink

      Hi there, at nearly 10000 litres you will struggle to equip a pond of that size and volume with a gravity filter system for £250. You’ll need a 5000lph pump and either a Kockney Koi 10000 or Nexus 20000 gravity fed koi filter. Plus a larger budget! Very sorry.

  • crai9g smith Posted 17/04/2020 at 2:20 pm | Permalink | Reply

    hi there I’m building a koi pond that will hold 3600l of water what’s the best pump/filter/uv size to go for ? thanks

    • Jeremy Gay Posted 21/04/2020 at 9:40 am | Permalink

      Hi there either opt for an Eazy Pod Complete by Evolution Aqua, and a 5000lph pump, or a Swell Pressure Filter 20000 and 13000 filter pump kit, or an Oase Filtoclear Premium Set 20000. If you want a waterfall go pressurised, but if you want an easy filter that won’t block, go for the EazyPod.

  • victor evans Posted 18/04/2020 at 12:20 pm | Permalink | Reply

    Hi Jeremy.
    My pond is [ 8x7x3 feet. volume is 4757 ltrs , pump is a Swell 7500 . I want to get a Oase biosmart filter 16000.
    I have about 30 small to medium fish and 1 large one about 15 inch. plus a 3 foot waterfull.
    Would that be ok.

    • Jeremy Gay Posted 21/04/2020 at 9:45 am | Permalink

      Hi Vic, sounds good to me. It’s rated to 8000 litres with fish so should cope no problem. Many thanks.

  • Steve Henshaw Posted 19/04/2020 at 5:58 pm | Permalink | Reply

    HI, I’ve got a koi pond which holds 9000 litres of water. I’ve got a pump which is 18000 ltrs and was thinking of buying a filter box to match the pump to clear the water or is it best to buy a smaller pump and new filter box. I have been looking at your website and don’t mind spending £500 to £600 but I want to get my water clear so I can enjoy the koi. I have 14 koi at the moment from a foot to two foot in length, can you help me as the more I read the more confused I get. Thanks, Steve.

    • Jeremy Gay Posted 21/04/2020 at 9:59 am | Permalink

      Hi there yes that is a big pump for a 9000 litre pond, and you would only need that if supplying a very large, very high waterfall. Even the largest pressurised and box filters on the swell site don’t recommend flow that great, so either valve it down or split it to two filters. Do that and the world is your oyster.

  • Jeremy Posted 19/04/2020 at 8:34 pm | Permalink | Reply


    I currently have a koi pond but we are filling it in and building one approx double the size

    We are looking to build the new one. 3.5 m x 3.8m
    And dig it about 5foot deep I think that’s about 4500 gallons in size

    My question what size pump do I need and what size filter
    Thank you

    • Jeremy Gay Posted 21/04/2020 at 10:02 am | Permalink

      Hi there I would go gravity fed with bottom drain, Nexus 320 filter, 10000lph external pump and a 110 watt UV. Combine that with a nice big airpump and ideally a surface skimmer built into the side wall with its own filter (like an EazyPod) and you will have a perfect koi pond.

  • Paul Gardner Posted 21/04/2020 at 8:21 pm | Permalink | Reply

    Hi Jeremy
    I have a pond of about 2200 litres with 33 goldfish (including 4 ghost koi). I run a 4000lh pump through a pressurised filter (6250 aquagarden). I’ve measured the pump flow at the head inlet of the filter and it is flowing into the filter at 2700lh,however after it flows through the filter ,the water exits at only 480lh.Is this correct? Or should it flow through the entire system at 2700lh? Baffled! I’ve purchased a 16000l gravity filter to see if it flows better.
    Paul G

    • Jeremy Gay Posted 28/04/2020 at 9:43 am | Permalink

      Hi Paul, it sounds like the pressurised filter is itself causing considerable head and frictional loss, causing flow to drop right down. Are the sponges clean? Do they need replacing with new? Is the unit set up right? Another good tip is to make sure you use the widest hose diameter you can. along with the largest diameter step on the hosetails, cutting off the narrower hose tail steps as they will definitely restrict flow. Do all that and a 4000lph pump should deliver at least 2000lph through a clean pressure filter, I would have thought. Flow will be less restricted through the gravity filter as water isn’t under pressure, and if the filter blocks, water will simply bypass.

  • Mick Posted 23/04/2020 at 5:55 pm | Permalink | Reply

    Hi , need advise as don’t want to get this wrong. Hopefully building a raised pond and was wondering what size pump and filter would I require. Plus any recommendations (mid-range price)
    Size 3.5m x 1.5m x 1.2m (depth)
    Thank you

    • Jeremy Gay Posted 28/04/2020 at 9:57 am | Permalink

      Hi there you have 6300 litres, so choose a pressurised filter system including pump and UV for 7000 litres. Choose a system for 14000 litres or more if you intend to keep koi, as filter recommendations double when keeping such big, messy fish.

  • Lindsey Posted 25/04/2020 at 10:26 am | Permalink | Reply

    Hi Jeremy. I’m a complete novice at ponds!!! My pond is 1.5 meters deep and 1meter squared. As yet no fish or plants. I would like to have a small waterfall on one side (which my husband is making with reclaimed sandstone). I’m struggling with choosing the correct pump/filter as the ones I have seen seem to have to have a separate reservoir. My other situation is that it must be 100% solar powered! Can you help?

    • Jeremy Gay Posted 28/04/2020 at 10:12 am | Permalink

      Ah, there are no 100% solar-powered filtration systems I’m afraid, as a filter needs constant, uninterrupted flow year-round, day and night. An all in one filter consisting filter, pump and UVC in one unit which sits in the pond sounds like its what you need, but alas, there isn’t a solar-powered one. You can get a solar powered pump which will run the waterfall on sunny days however, just not filter it.

  • tony Posted 25/04/2020 at 4:05 pm | Permalink | Reply

    Hi can you help me? I have a pond that is Length 6meter width 2.7meter and depth 1 meter. Can you let me know what size pump and filter system I require, I currently have a 9000pump and filtration system but pond water is very dirty with sediment on bottom many thanks Tony

    • Jeremy Gay Posted 28/04/2020 at 10:19 am | Permalink

      Hi there that is a large volume of 16,200 litres. You’ll need a large filter which can handle a lot of dirt, like a Nexus 220, suitable for koi ponds of up to 20,000 litres, or even a 320, for 30,000 litres. Then match it up to a 15000lph solids handling pump. To give any new filter a fighting chance however I would purchase a pond vac and hoover as much of that sludge out as you can before hand, otherwise the filter will work overtime for days or weeks trying to remove it. Add a sludge treatment too, to help break it down, liquify it, and clear the water.

  • David smith Posted 26/04/2020 at 11:26 am | Permalink | Reply

    Hi we are getting a 8ft octagon pond which is 107cm high. Considering an Oase bio press 10000 would this do the job. Have 3 koi approx 8” long and 10 goldfish about 5” long regards.

    • Jeremy Gay Posted 28/04/2020 at 10:26 am | Permalink

      Hi there yes I think it would be ok. I estimate your total water volume to be around 5000litres, so a filter suitable for 10,000 litres is right because you double recommendations for koi.

  • Lance Posted 26/04/2020 at 8:36 pm | Permalink | Reply

    I have a new koi pond measuring 3 x 2.2 x 1.5 meters.
    I have around 15 koi to go back in. 4 of which are 15-19”.
    I have 2x oase filtoclear 16000 ready to use.
    Could you please advise me on what size pumps I would need for each of the filters?


    Mr Callow

    • Jeremy Gay Posted 28/04/2020 at 10:35 am | Permalink

      Hi there, you have 10,000 litres of water. I would run those filters on 6-8000lph solids handling pumps each.

  • Lorenzo Posted 27/04/2020 at 8:14 am | Permalink | Reply

    I have a raised fish pond 8 ft octagonal water volume 4297l what size filer and pump do I need thank you

    • Jeremy Gay Posted 28/04/2020 at 10:37 am | Permalink

      Hi, I would choose a pump, pressurised filter and UVC set for 5000 litres, or 10,000 litres if you intend to keep koi. Many thanks,

  • Steve Posted 27/04/2020 at 10:35 am | Permalink | Reply

    Sadly just lost a load of our goldfish and koi as the pump failed and its taken us a while to fit a temporary one. Pond is 2500 litres, with a lotus clean 2 green 18000 filter, so should be more than enough for koi? Pump was a Swell 1400 in use for over a year and fish seemed OK. I’ve just bought a 3300 as we thought the original had failed (it hasn’t it was the switch box) will this be enough for the filter box and the koi?

    • Jeremy Gay Posted 28/04/2020 at 10:40 am | Permalink

      Hi there the new pump delivers 3500lph, so it is large enough for a 2500 litre pond. You should get clear, well-filtered water no problem with that combination.

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