Nitrogen Cycle: (simplified)       The purpose of a filtration system in a closed system such as a pond is to emulate as closely as possible the natural nitrogen cycle of nature.

Fish eat food and create waste. Debris falls into the pond and decomposes.

These dissolved waste products, primarily ammonia , meet nitrifying bacteria in the biofilter and are digested, creating their own waste products.

This waste product is then digested by a secondary bacteria and in turn they produce a waste product: nitrates . Nitrates are far less toxic to the fish population than the original ammonia waste product.

In the natural world, a myriad of other bacteria and countless other microbes would digest this nitrate waste product and therefore consume this nitrogenous waste. Plants, also use nitrates as a nutrient source.

In a closed system, such as a fish pond the most typical method of removing this final waste product is by doing 20% water changes each month. (This 20% water change water is great for your garden or house plants as it is rich in nitrates, a basic plant nutrient.)

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