Chlorine burns fish. It can damage their scales and gills and some severe circumstances it can kill.

Chlorine is added to drinking water in most parts of the world to kill bacteria. It therefore follows that if you fill or top up your pond you are adding chlorine to it and putting your fish at risk.

Evolution Aqua in-line De-Ionisers purify tap water using a de-mineralising process called de-ionisation.  The new De-Chlorinator from EA is a quick and simple method of filtering-out harmful chlorine and other impurities from tap water.

GAC Cylinder Purifers are easy to maintain, and come in a variety of sizes to fit your pond.

The water we drink is not fit for Koi by any means. Mains water contains Chlorine and many hard metals, that are not healthy or productive for a healthy and balanced nitrogen cycle. 

To have effective water purification it is best to allow for very slow flow rates.  The longer the water takes to pass through the purifier, the greater the benefits of the purification system. 

A flow rate of one to two gallons per minute should adequately remove any nasty impurities, and the water can safely be added directly into your filtration system or the pond.