General description AlwaysH Aquarium Filter is a versatile biochemical foam filter designed for effective mechanical and biological filtration in aquariums and ponds. With a large size of 50×50×4cm, these filter mats can be easily cut to fit various filter systems, ensuring optimal waste capture without clogging. Technical specifications Dimensions: 50×50×4 cm Pore size: 50 PPI (pores per inch) Usage Ideal as pre-filters for wet/dry filters, collection tanks, and reservoir filters. Recommended to use a combination of sponges with different specifications for enhanced filtration performance. Regular cleaning is advised; the sponges are reusable after cleaning. Other information Safe for aquatic animals and free of dyes. Durable and vacuum sealed for easy storage, taking up minimal space.