 Choosing a filter media warrants as much consideration in our planning, as should any other major element in our pond system. Filter media is not only for removing pollutants and debris from our ponds, but for allowing beneficial bacteria to colonize and grow.
Bacteria convert harmful nitrogen by-products from aquatic animals into less harmful nitrates. This process occurs naturally in nature's lakes and streams. In a Koi pond these bacteria are found on the walls of our ponds. They also can be found on the inside walls of the pond plumbing, attached to the skimmer basket, and on the rocks that form a waterfall.
The reason it is important to consider what filter media to use when we build biological filter systems, is to increase the available surface area for these bacteria to colonize.
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