Foam Filter Pads Reusable Foam Filter Aquarium Filter Foams Washable 47×47×4cm Cut Any Size Aquarium Filter Koi Pond

filter cotton is made of polyurethane available in thicknesses 47 x 47 x 4 cm and 47 x 47 x 2 cm as well as in pore sizes 20/35/50 PPI It can be selected according to water and type of fish filtering particles while ensuring physical interception fine-pored structure intercepts fish waste food remains and suspended particles surface area promotes growth of nitrifying bacteria breaking down substances it maintains stable performance after rinses and washes maintaining clear water essential for fish and aquatic life made from polyurethane it is flexible and elastic resistant to prolonged water flow and repeated washing without breaking or deforming ensuring stable and long-lasting use designed pores ensure optimal water circulation and sufficient oxygenation avoiding clogging and oxygen deficiencies Black filter sponge can be cut to fit all aquarium filters such as wet and dry filters external filters and motorized filters Suitable for aquariums settling tanks ponds hydroponic systems making installation easy