How to Build a Pond Filter
A pond filter can be built from a plastic file crate, furnace filter material, and lava rock. You will need to cut the filter material to fit the crate, and then layer the lave rock into the bottom of the crate. Add your pump and make sure to cut holes that are just big enough to pass the electrical cord and discharge hose through.You can find more information here: http://www.google.com/url?sa=t&source=web&ct=res&cd=5&ved=0CBgQFjAE&url=http%3A%2F%2Fwww.mvwgs.org%2Ffilter.
