Product: Biological Filters
Description: The waterfall box is usually where most biological filters are located. Inside the box are a couple of pads of filter media that offers a  ton of surface area for beneficial bacteria to grow on. The beneficial bacteria turns all the harmful things into beneficial things.
Application: The waterfall spillways vary based on the size of the pond  and the water flow.
Price: $239.98 (1,000gallons) - $599.98 (6,000gallons)