Barrow Kwan

I don't know if veggie filter is an official name. Some sites called this Bog Filter. So what is veggie or bog filter? I am not going to explain but you can check this out http://garden-pond-filters.com/veggiebio.htm I have a little pond which I need to clean up the filter every one to two weeks. This is a boring work and not very environmental friendly because I have to use lot of water to wash the filter media. After searching the web, I found people use this filter on their pond.