Using mesh or foam screens, a mechanical filter traps algae and larger pond debris, thus keeping your pond water cleaner. Not surprisingly, you have to rinse it out often and replace it periodically. A pump attached to a filter protects the pump and keeps the water moving through: dirty in, cleaner out. Match your filter to your water garden (or run the risk of ruining the pump by burning it out — or at least causing yourself too-frequent rinsings). If your water has a lot of algae and fine particles, you don't want a real fine mesh, obviously.

Biological filters are larger, more expensive, pondside contraptions, recommended for pools with lots of fish or many large fish such as koi. The water is cleansed with gravel and beneficial bacteria; fish waste is converted from ammonia into nitrate, boosting water health for the fish as well as the plants. See Figure 17-5.

Figure 17-5:

It's important to properly align the elements in a biological filter so it will work properly.



3 Foam Vtt^ Layers

Water Outlet

Magnetic In-line Algae Inhibitor

Water Outlet

^ V

\ _ -C /




1 1

V i


/\ '


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Biological Water Filter ( cross sec tion)

Water Inlet

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