The Industry Standard for Nonwoven Filter Media Since 1987

Poly-Flo offers the most complete range of filter media available today. Our technical research team is constantly monitoring the industry and making available to our customers the newest and most innovative products to meet the latest filtering requirements.

What is Mechanical Filtration?

Mechanical filtration simply entails the removal of unwanted particulate and detritus from pond water by trapping particles in a closely-woven filter media until the particles are removed from the media by cleaning…much like an air filter. Mechanical filtration is highly efficient, and will trap all but the smallest particles, but this same high efficiency requires the pad to be cleaned at more frequent intervals due to clogging. Poly-Flo’s FM-SP is an example of a mechanical filter media.

What is Biological Filtration?

Biological filtration entails the removal and/or conversion of pond solids, along with chemical wastes such as ammonia and nitrates — by different strains of bacteria which feed on them. Ammonia and nitrites can be extremely toxic to fish, and these various bacteria eventually convert both to nitrate, which is less harmful to fish, and is readily utilized by aquatic plants. Biological filter media provides a more open density or “weave” in order to allow for the free flow of water, while simultaneously providing a high surface area for the bacteria to colonize and “scrub” the water as it passes through. (see surface area specs) While biological media will act as a barrier to larger particles, its primary function is to provide colonizing habitat for beneficial bacteria. In some systems, a mechanical pre-filter is also used in conjunction with a biological filter. Poly-Flo’s FM-JC & FM-JC-2 are examples of biological filter media.

Toxicity Testing

Poly-Flo’s toxicity tests were performed on our black filter material by BioAssay Lab (formerly Guardian Systems Leeds). The lab ran acute and chronic toxicity tests using standard EPA protocols. These test organisms were fathead minnows (Pimephales) and water fleas (Ceriodaphnia). Our products exhibited no adverse effects on the survivability or reproductive ability of either organism.