Coarse Pre-filters

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Coarse Pre-filters are used to remove most of the large suspended matter so that fine-filters will last longer. They may be large granular media filters that are backwashable, or smaller, less costly cartridge filters comprised of plastic foams, wound string filters, or fibrous mats of various compositions. They need to be inexpensive enough to permit replacement often. Almost all of them are susceptible to channeling and dumping.