You need to know that the Koi pond filters are meant to remove pollutants from water, and not to clear the water. The clear water is just a by-product of Koi pond filters. If Koi pond filters are not used to remove toxic pollutant build-up (like ammonia, nitrite etc.), the pond can prove lethal for your Koi fish. Thus, good filtration systems help ensure that your Koi fish live longer and are healthy.

When you are looking at various biological filtration options, remember what a Koi pond filter is meant to do. The most basic pond filtration must always have two stages, namely, mechanical filtration and biological filtration.

Mechanical filtration process

In the mechanical filtration process, the solid organic debris must be trapped, so that they can then be manually removed. Since organic waste decomposes very fast, be it in the pond water or in the filter, it needs to be removed regularly. If you let the organic waste decompose, components that are harmful to the Koi fish will be produced. If you don’t remove such debris from the pond/filter, the water flowing into the pond will contain these microbes and will continue to make the pond water dirty.

Biological filtration process

In the biological process of Koi pond filtration, compounds like ammonia and nitrite are broken down into less toxic compounds.  Since there are a variety of filters that are available in the market, you need to be sure of what you are looking for. Depending on the size of the pond and other factors, choose filters that fit your Koi pond requirements. Before investing too much in any Koi pond filter, ensure that the mechanical and biological filtration are being handled properly.

Kaldnes Moving Bed technology is an industry proven technology and is found in Koi pond filters like Nexus and Evolution Aqua. Such Koi pond filters are highly efficient, easy to use and don’t require too much maintenance. Yet another excellent filtration system is the Aquadyne bead filtration system. New filtration technology can be used to trap organic waste in buoyant plastic beads. The useful bacteria multiply in the beads, and break down ammonia and nitrite into less harmful compounds. It would be best to check your local pet store and ask around, before you buy your Koi pond filtration system.

Remember, the filtration system you buy must break down toxins and must also remove organic particulate wastes. If you choose a filtration system that provides mechanical and biological filtration, maintenance of the pond becomes fairly simple.