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4.2.2 Filter media
Filter media
Infact, all media work mechanically, and biologically if left undisturbed over long period. In the latter case, all media will be eventually colonized by bacteria. Plastic, glass and gravel may offer good bed (surface area) for bacteria to grow on. Of all the filter media, the cheapest are floss, foam and gravel. Peat, on the other hand, is not long lasting and needs replacement at quick intervals (as it is quickly exhausted).
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