www.waterfilters.net/Aqua-Pure-AP431-Hot-Water-Heater-Filter.html The Aqua-Pure AP431 is the replacement cartridge for the AquaPure AP430 Hot Water System. The AquaPure AP431 will extend the life of your hot water heater by reducing scale build-up and corrosion. The AquaPure AP431 reduces money wasting maintenance costs.
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