WHAT ARE THE DIFFERENT BIOFILTRATION OPTIONS?
Biofilters are a habitat for bacteria to live. Biofiltration is the term for ‘processing of wastes by aerobic bacteria’. Biofilters are generally used to treat the fish tank water, especially in deep flow / raft systems and NFT systems. The biofilter usually contains biomedia, a plastic media which has been designed for maximum surface area to allow colonisation of bacteria, and is very light and easy to handle. The biofilter container is located between the fish tank and the grow beds, usually after simple mechanical filtration and is generally incorporated into the system so that no extra pumps are needed. In a media based system, the medium (either gravel or expanded clay) acts as the biofilter, allowing bacteria to proliferate on its surface area.
