ProEco Bio Flow Biological Pond Filters effectively clean your pond while using lower pump flow requirements. There are no better gravity-flow pond filters on the market, and we highly-recommend you purchase one for your pond.

In order to keep your pond water clean and healthy, these gravity-flow pond filters work in the following way:

1. Water is aerated when first pumped into the filter
2. The filter material traps dirt and suspended particles in the pond water and houses beneficial bacteria colonies that break down and remove ammonia and nitrites.
3. An optional ultraviolet clarifier aids in flocculating suspended algae particles so that the filter can remove them from the pond