The Aqua-Pure AP431 is designed for use with the following:
The AP431 Hot Water System Protector Cartridge will extend the life of your hot water heaters or tankless hot water sytems by stopping scale build-up and corrosion. The AP431 water filter cartridge used with the AP430 Hot Water System Protector not only increases the efficiency of your hot water sytems so they run cleaner, but it also saves you money on maintenance costs.
The Aqua-Pure AP431 specifications:
The AquaPure AP431 in-line scale inhibitor system water filter should be replaced every 4 to 6 months. The AP431 is also known as AP43110.