FILTERS

An effective filter must remove both solid and dissolved matter from pond water. The most common means of removing solid matter is mechanical filtration: for example, spinning water to create a vortex that drops the solids to the bottom of a tank, or straining the water through openings too small for the solids to pass. The most common means of removing dissolved matter is biological filtration: for example, passing water through a media that supports natural waste-eating bacteria, or growing plants in the water. Filters that only perform mechanical filtration won't prevent green water; filters that only perform biological filtration will clog quickly and require frequent maintenance. Effective pond filtration schemes must employ both mechanical and biological filtration.

There is no one type of filter that will work in every pond. Ponds with few or no fish can be filtered effectively with inexpensive filters such as waterfall filters, gravity filters, carbon filters, and bog filters. Ponds with lots of fish usually require more expensive filters such as vortex filters and bead filters. Regardless of the filter you select, it's always a good idea to using a pre-filter or skimmer to further reduce the need for filter maintenance. We also recommend routine use of UV sterilizers for ponds with high fish loads (see Other Products).

waterfall filters

bog filters

vortex filters

bead filters