The Aqua-Pure AP917HD is the correct replacement cartridge for the following filter systems:
The Aqua-Pure AP917HD Replacement Filter - 56210-06 is a replacement water filter cartridge for the Aqua-Pure AP903. This whole house water filter cartridge reduces sediment and the taste & odor of chlorine in your drinking water. This whole house chlorine filter has a 5 micron rating and carbon block filtration with a non-woven blended pleat media.
Aqua-Pure AP917HD Replacement Filter - 56210-06 specifications: