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1. Biological Filtration
The next stage after the removal of the solids is the reduction of dissolved waste such as ammonia and nitrite.
http://www.pond-life.me.uk/ponds/filtration/biofilter.php

2. Filtration
A filter system serves two purposes for the pond, the first is to act as a mechanical filter and the second is to act as a biological filter.
http://www.pond-life.me.uk/ponds/filtration/filtration.php

3. Filtration Basics
A filter system serves two purposes for the pond, the first is to act as a mechanical filter and the second is to act as a biological filter.
http://www.sturgeon-web.co.uk/filtration.php

4. Mechanical Filtration
There are many ideas as to the importance of the first stage of filtration, but it is the most important stage to get right for a number of reasons.
http://www.pond-life.me.uk/ponds/filtration/mechfilter.php

5. Nitrate Filters
The last process of the aerobic filter is the production of nitrate. Although it is not toxic until levels are very high, in excess of 150mg per litre, the lower the levels the better it is for the fish.
http://www.pond-life.me.uk/ponds/filtration/nitratefilter.php

6. Ready Made Filters
The simplest filters consists of a foam prefilter on the front of the pump, these work in small ponds up to 500 litres.
http://www.pond-life.me.uk/ponds/filtration/readymadefilter.php

7. Ultraviolet Systems
Ultra Violet Clarifiers are probably the least understood and the most poorly sold pond products on the market.
http://www.pond-life.me.uk/ponds/filtration/uvsystems.php

8. Vegetable Filters
The most natural way to remove nitrate from the pond water is to use plants. As plants grow they use nitrate to build the leaves and stems that they use to collect sunlight to use to produce food for growth as they grow they require more nitrogen.
http://www.pond-life.me.uk/ponds/filtration/vegfilter.php