http://koipondcentral.com/articles/filtration.php
Various pointers on a variety of filtration systems
http://www.drsfostersmith.com/pic/article.cfm?aid=2153
Info on bog filters
http://www.pond-life.me.uk/forum/viewtopic.php?f=8&t=7981
Pump or gravity fed info
Various pointers on a variety of filtration systems
http://www.drsfostersmith.com/pic/article.cfm?aid=2153
Info on bog filters
http://www.pond-life.me.uk/forum/viewtopic.php?f=8&t=7981
Pump or gravity fed info
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