Topo-logic Systems, Inc. TOPO-LOGIC SYSTEMS, INC. Type A Replacement Cartridge Filter for Intex Pools - TOPO-LOGIC SYSTEMS, INC.
These filters are decent, not perfect, you go through a lot of them and aren't really washable, you can rinse them once or twice but then trash
These are the only filters I have used. Most of the time I go thru a lot of them but they do the job they are suppose to do.
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