Pond Waterfall Boxes are filters and waterfalls ALL-IN-ONE!
A waterfall filter box is a passage point water circulates through. Waterfall boxes purify water using beneficial bacteria and biological media. The water is filtered with biological filtration media where beneficial bacteria colonized on the media found inside of the waterfall box. The water raises to the top of waterfall box and spills out evenly.
How Waterfall Boxes work:
How to determine what waterfall box you need: