Filbur FC-1440 C-6640 PJ40-4 Spa/Pool Filter Cartridge is a replacement spa and pool filter cartridge from Filbur Manufacturing, made for systems that require a clean, properly matched cartridge to maintain water clarity and steady circulation. It also references common cartridge cross numbers such as FC-1440, C-6640, PJ40-4 for easier comparison against the part being replaced. This cartridge is intended for use when the existing filter is worn, damaged, difficult to clean, or no longer supporting normal water flow through the spa or pool equipment.When selecting a replacement cartridge, always compare the part number, length, outside diameter, inside opening, end-cap style, and any printed cross-reference numbers on the old filter before ordering. A correctly matched cartridge helps reduce strain on the pump, supports better filtration performance, and keeps routine maintenance more predictable. Replacement filter cartridge for compatible spa and pool filter systems Filbur Manufacturing model for easier identification and reordering Helps trap debris and support clean, clear circulating water Useful when replacing a worn, clogged, cracked, or hard-to-clean cartridge Compare all dimensions and end-cap details with the original cartridge before purchase
