What is the difference between Biological and Mechanical filtration?
Mechanical filters are used to remove floating particles from the water. Biological filters are used to process the nutrients from the water using beneficial bacteria. The mechanical filter is attached to the intake of the pump, trapping suspended particles before they enter the working parts of the pump. The biological filter is positioned outside of the pond for easy access to the filter media where the bacteria grows. Ideally, the biological filter would be pre-filtered by a mechanical filter to keep organic debris from clogging the biological part of the system.
