The 3M™ Aqua-Pure™ Whole House Scale Inhibition Replacement Water Treatment Cartridge AP431 for the AP430SS contains polyphosphates to bind calcium and magnesium hardness minerals, preventing them from precipitating out (or becoming a solid) and building up on metallic surfaces such as water heaters and plumbing fixtures like faucets, pipes and shower heads. Features include: Flow rates up to 10 gpm/37.9 lpm 25 – 125 psi/172 – 862 kPa pressure range 40 - 100°F/37.8°C temperature range System materials are FDA CFR-21 compliant* The overall design of our 3M™ Aqua-Pure™ AP430SS whole house scale inhibition water treatment system makes the 3M™ Aqua-Pure™ AP431 cartridge change-out easy for professionals, as well as end users. The 3M™ Aqua-Pure™ AP431 Whole House Scale Inhibition Replacement Cartridge is as easy to change-out as a light bulb. The scale inhibition system helps extend the life of downstream water-using appliances such as water heaters (standard and tank-less), clothes washers and dishwashing machines, as well as plumbing fixtures like faucets, pipes and shower heads by reducing scale build-up and corrosion. How It Works Polyphosphates in minute concentrations of 2-3 ppm, effectively help prevent scale build-up by inhibiting the deposition of hardness minerals onto metallic surfaces. Polyphosphates also helps prevent corrosion by forming a thin protective layer on the metal surface. The3M™ Aqua-Pure™ AP431 Scale Inhibition Replacement Cartridge is manufactured using FDA CFR-21 compliant materials* and is suitable for drinking and cooking water, and food applications. A History of Innovation 3M branded water filtration products have been addressing water quality issues for over 50 years. 3M products offer a wide range of solutions designed to address many types of water quality concerns. Third-party certifications, such as NSF and WQA, are an advantage provided on many 3M water quality improvement solutions. 3M, a household brand name, is a known leader in filtration technology recognized for innovation, trust and quality around the world. Having clean and clear drinking water in your home is both a pleasure and a reassurance that you're giving your family the best. With a water filtration system from 3M Purification, you can provide filtered drinking water for every member of your family. From whole home water filtration to drinking water systems, look to 3M Purification to help you find the right solution. About 3M For more than a century, 3M has applied innovation and technology to improving our customers' lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. The 3M brand, across thousands of products, represents consistency, superior quality, and value. Our success begins with our culture of creative collaboration that inspires a never ending stream of powerful technologies and product solutions that make life better. We have an ability to apply our technologies – often in combination – to an endless array of real-world customer needs. Of course, all of this made possible by the people of 3M, and their singular commitment to make life easier and better for people around the world. 3M is committed to providing innovative, cost-effective products that help protect people, equipment, and our environment. 3M Purification Inc. (formerly CUNO Incorporated), provides filtration and separation solutions for residential, food service, science labs, industrial, marine, and other applications. *Surfaces that are in contact with water are FDA CR-21 compliant