Swell Control Green Water

6 reviews

Get clearer, cleaner water for less by opting for Swell's own Control Green Water solution, designed to quickly rid your pond of the causes of green water. Comparable with major branded products, this version is sold cheaper because it's our own - passing savings on to you.


  • Control Green Water 6 Sachets BOGOF deal
    code: GW6 In stock More than 10 in stock

Product Information

The Swell Control Green Water contains a mixture of friendly bacteria that can help reduce the levels of nutrients which encourage algae to grow. In addition to being easy to dose and use, it is also completely chemical free and can treat a 1000 gallon pond for up to 3 months.

The special mix of bacteria in Control Green Water help reduce nitrate and phosphate levels, aid the break-down of bottom sludge and odours, as well as helping to make the water less murky.

It also contains barley straw which can further inhibit the growth of the algae that turn the water green, thanks to microbes that consume algae boosting nutrients.

Key Features:

  • No chemicals
  • Easy to dose
  • Economical to use
  • With added Bailey Straw
  • Comes in sachets, so no mess

How to use

  • Each water-soluble sachet contains enough to treat up to 1000 gallons/4546 litres of pond water.
  • Simply drop a sachet into your pond or pond filter once a week during spring, summer and autumn and allow it to break down.
  • The product is completely harmless, so it is quite safe to add a whole sachet to smaller ponds or use multiple sachets in a larger pond.

For Best Results

  • Use a double-dose the first time you use the product.
  • Place the sachet in an area of flowing water, such as in the filter or near a waterfall.
  • Ensure that your pond is well filtered and aerated, particularly at night, when oxygen levels drop.
  • Use in alkaline water when the temperature is above 10°C / 50°F.


Beneficial bacteria and barley straw. This product is not a medication, pesticide or herbicide and is not intended as a substitute for one.

  • 6 x 28g Sachets - Treats 27,300 litres / 6,000 gallons.

Latest Customer Reviews

  • Rating
    Date 31/07/2016 16:07pm
    Swell Control Green Water 6 Sachets BOGOF deal
    Feefo Logo
    Was supposed to treat green water. I added more than enough of the sachets to my pond and.......still green water!
  • Rating
    Date 21/03/2016 18:03pm
    Swell Control Green Water 6 Sachets
    Feefo Logo
    Products expiry date had passed. Used it anyway.
  • Rating
    Date 17/11/2014 16:11pm
    Swell Control Green Water 6 Sachets
    Feefo Logo
  • Rating
    Date 17/07/2016 11:07am
    Swell Control Green Water 6 Sachets BOGOF deal
    Feefo Logo
    It's a bit early to say, not noticed any improvement yet
  • Rating
    Date 16/07/2016 08:07am
    Swell Control Green Water 6 Sachets BOGOF deal
    Feefo Logo
    Seem to be doing the job!
  • Rating
    Date 06/10/2016 08:10am
    Swell Control Green Water 6 Sachets BOGOF deal
    Feefo Logo
    Worked well in less than 24hrs