filter medium
Material in a mechanical or biological filter trapping suspended particles or providing a suitable surface for colonisation by beneficial organisms.
Results for “filter medium”
Ichthyological terms, not general ones.
fluidised bed filter
Type of biological filter comprising a vertical column within which sand or other fine-grained filter medium is held in suspension, i.e., a fluidised state, by a continual upward flow of water. The many fine grains of filter media provide a huge surface area for bacterial colonisation.
bioball
Type of biological filter medium consisting of a plastic ball designed in such a way that the available surface area for bacterial colonisation is maximised. The precise form differs depending on manufacturer.
gravel
Unconsolidated mixture of rock fragments commonly used as a substrate in aquaria. Also forms the filter medium in undergravel filtration.
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