Keep your pond filter running efficiently with the 25" x 18" Replacement Pond Filter Foam Set. This set includes three layers of foam: one fine, one medium, and one coarse, providing optimal filtration for gravity-fed, flow-through filters. To maintain a healthy aquatic environment, replace foams once they're exhausted. You can test their effectiveness by squeezing the old foams – if they don't bounce back, it's time for a replacement. Change one foam at a time to sustain levels of beneficial filter bacteria. These universal filter foams fit most filters, but ensure to check sizes before purchasing. The foams can easily be trimmed and have holes cut to fit your specific filter setup. Features: Set of 3 foams: fine, medium, and coarse For use in gravity-fed, flow-through filters Maintains healthy levels of filter bacteria Universal size, easily cut to fit Colours may vary depending on availability
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