Product details:

The TetraPond Bio-Active Filters force water through bio-activators to help maintain clear and healthy pond water. These open-profile bio-activators provide a large active surface area for beneficial bacteria to colonize. Its biological filtration converts harmful ammonia into relatively harmless nitrates. These filters are designed with an easy, one-step back-flush valve for thoroughly removing dirt and debris while leaving the beneficial bacteria on the bio-activator surfaces intact and robust. These filters are designed to be buried in the ground or landscape and feature a dark green top so it will blend into the surroundings. Each pressure filter is sold as either a stand-alone unit or with an integrated UV clarifier to provide permanent control of suspended algae and reduce green water.