The importance of treating phosphates in fish ponds

Phosphorus is one of those chemicals that can creep up within a fish pond or aquarium without you knowing it.  It doesn't seem to affect fish health, and if you have a good filter, the water will still be clear due to the UV light sterilisation.

So why are phosphates a problem in the aquatic environment?  Because algae thrives off it! 

Algal growth within the pond is not only unsightly, it can lead to issues with your fish health.  Although algae puts oxygen into the pond while it is photosynthesising during the day, it robs the water of oxygen during the night, so in heavily stocked ponds can lead to fish deaths.

Phosphates tend to accumulate in ponds because biological filtration systems do not deal with them at all, which means that over time, phosphate levels incrementally increase unabated.

Sources of phosphates include fish food, leaves, detritus, and even tap water.  The better quality fish foods tend to release less phosphates.

Removing phosphates

Removing phosphates from your fish pond can be as simple as doing water changes or by using products that "lock up" the phosphates and drop them out of solution.  Doing so will make the phosphates unavailable for algal growth.  A great product to put into your pond periodically is "Maintain for ponds" which will bind the phosphates and add good bacteria to your pond to make it much more difficult for the algae to grow.  For larger ponds in excess of 3000 litres, we recommend Phosphate remover by HyClor

We recommend that all pond owners should check phosphate levels monthly so that they can ensure that levels are close to zero at all times.  A test kit is the best way to do this or you can bring a jar of your pond or aquarium water to our shop and we will test it for you!

Buy a phosphate test kit here

If you have any questions regarding phosphate in your pond water, please let us know