Foam Filter Pads, 35 PPI Reusable Foam Filter, Aquarium Filter Foams, Washable 47×47×2cm Cut Any Size for Aquarium Filter and Koi Pond

The filter cotton is made of improved polyurethane (PU) and available in two thicknesses: 18.7-18.7-1.5 inch and 18.7-18.7 inch, as well as three pore sizes: 20/35/50 PPI. It can be selected according to water quality and type of fish, accurately filtering different particles while ensuring physical interception. Its fine-pored structure effectively intercepts fish waste, food remains and suspended particles. Its large surface area promotes the growth of beneficial nitrifying bacteria, breaking down harmful substances. It maintains stable performance even after many rinses and washes, thus maintaining clear and healthy water, essential for fish and aquatic life. Made of polyurethane, it is very flexible and elastic, resistant to prolonged water flow and repeated washing without breaking or deforming, ensuring stable and durable use. The scientifically designed pores ensure optimal water circulation and sufficient oxygenation, thus 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, etc., it is compatible with various filters, making installation easy even for beginners. Cleaning and maintenance is simple and frequent replacements are useless. Due to the compressed packaging of the product, if you find that the filter sponge is slightly deformed upon receipt, you can easily return it to its original shape: soak it in warm water for a few minutes to make it swell, then let it air dry; or use a hair dryer at low temperature to heat it evenly until it returns to its original shape.