The POLY-FILTER is for filtering and purifying both fresh and salt water aquariums. It is a formulation of a special patented material bonded to a synthetic matrix. By means of a unique proprietary process, the POLY-FILTER is made...
Replacement Cartridges for Ster-il Filtration System - 3 pack
1 - 0.5 micron bonded carbon block filter
1 - Molecular Absorption Disc Media
1 - Fin-L-Filter 0.20 Micron bag filter (U.S. Patent)