Why Filtration?
Filtration is needed to process nutrient buildups within the pond, lake, dam, tank or water body. The source of these nutrients can be from runoff, residues from water use, fish, livestock faeces or other things like garden fertilisers. Fish can produce waste through faeces and uneaten feed. The accumulation of nutrients will make algal blooms more likely and ultimately decrease or deplete oxygen levels. Chemical buildup from the waste products can also be toxic and harmful and depending on species sensitivity, deadly.

A common problem for many water bodies ranging from lakes to small aquariums is an accumulation of ammonia or nitrites. This creates a toxic environment for fish and can hinder oxygen uptake from the water. Accumulation of nitrites can also cause “Brown Blood Disease” in fish stocks. Ammonia and nitrite are produced from fish, uneaten feed, faeces and decaying organic matter such as plant matter. In a functioning ecosystem, these toxins are converted to nitrates which can be readily taken by plants but accumulation is very common when newly set up filtration systems have not been given enough time to build up a nitrifying bacteria population sufficient to handle the ammonia load of the water body.

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