AQUACREST Replacement AP5527 Reverse Osmosis Pre and Post Water Filter Cartridge, Compatible with Aqua-Pure AP5527, 5598101, AP-RO5500, APRO5500 Reverse Osmosis System (1 Set) Efficient coconut carbon block for ultimate purity by reducing harmful contaminants. Note: For cold water only! Optimal performance for up to 12 months or 750 gallons, which will vary based on water conditions. Offers reasonable price without compromising quality. Easy to install. For detailed instruction, please kindly refer to the Instruction Manual in the box. Interchangeable with Aqua-Pure AP5527 5598101 AP-RO5500, AP-RO5500, APRO5500 Under Sink Reverse Osmosis System. This filter is not sourced by or sponsored by 3M. Advanced material for refreshing water Easy setup wizard. Optimum results for up to 750 gallons or 12 months, whichever comes first will vary based on water quality