Finest Filters 4 x Compatible with Tetratec EasyCrystal BioFoam 250/300

You are purchasing QTY 4 Tetratec EasyCrystal BioFoam 250/300 compatible replacement foams. These foams are a Finest-Filters filter compatible with Tetratec filter cartridge, which perform the same function. To use our filter pads, simply remove the old foam, retaining the plastic frame, and insert a Finest-Filters replacement foam filter pad. PLEASE NOTE: The plastic frame is NOT included, you are simply purchasing the foam which fits inside the plastic frame.