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https://www.swelluk.com:443/easy-life-fosfo/ 
Easy Life Fosfo
Easy Life Fosfo is the simple way to top up your phosphorus levels in your tank should they fall too low - easily applied with quick effects.
Product Information
Available in either 250ml or 500ml bottles, you can use Easy-Life Fosfo to easily compensate for phosphorus deficiencies in your aquarium water.
While high levels of Phosphorus in your water can be a bad thing, so can a drop in levels too, as Phosphorus is needed in your tank water as small amounts of it are needed by the organisms in your tank to live - it's one of the basic building blocks of life!
Too much of it can cause a lot of algae growth, but too little can be a problem too as it inhibits your live aquarium plants from thriving.
Phosphate levels are generally best kept low unless you are keeping a fish-free tank or one that is low stocked, in which case the phosphorus is going to be being produced in your fishes waste.
Regain a good phosphorus level with this Easy Life Fosfo, available at a brilliant price from Swell UK and ready to be despatched to you the same day when you order before 3pm weekdays!