The 3M Aqua-Pure Whole House Scale Inhibition Replacement Water Treatment Cartridge AP431 for the AP43SS was designed to reduce scale build-up on hot water-using appliances such as water heaters (standard and tank-less), clothes washers and dishwashing machines, and on plumbing fixtures like faucets, pipes, and shower heads. The AP431 is as easy to change-out as a light bulb.
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