The Oase FiltoSmart 300 Replacement Filter Foam Set provides effective mechanical and biological filtration within your Oase FiltoSmart External Filter to keep your aquarium and its inhabitants happy and healthy. Mechanical filtration is the removal of debris and waste from the aquarium to provide clear water. Biological filtration occurs through the colonisation of your filter foams by beneficial bacteria which break down toxic ammonia and nitrite, caused by fish waste to create healthy water for the aquarium inhabitants.
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