Whole house filters improve the quality of all incoming water, helping to provide better drinking water, cleaner dishes, brighter clothes, cleaner skin and shinier hair. Water filtration also helps save money by improving performance in refrigerators, ice makers, water heaters and even cleaning detergents.The 3M Aqua-Pure Whole House Sanitary Quick Change Water Filter System AP904 is the industry’s first water filtration solution that truly addresses water quality and convenience in a single unit. It contains high performing, multitasking filter that help reduce contaminants such as sediment, chlorine taste and odor, and scale. The AP904 improves water quality and taste while supplying cleaner, clearer water to every water source point in the house. These systems are referred to as point-of-entry (POE) systems and are installed downstream from the water meter or well pump. These systems help protect plumbing and fixtures while reducing unpleasant taste, color and odor. Maintenance of a whole-house water filter system is as simple as replacing a light bulb with a simple quarter turn of the 3M Aqua-Pure AP917HD-S Replacement Water Filter Cartridge or placing a service call with your local plumbing professional.The scale inhibition feature uses polyphosphates in minute quantities to bind calcium and magnesium hardness minerals, preventing them from precipitating out and building up on metallic surfaces which can reduce flow rates throughout the homes plumbing system. 1" stainless steel inlet and outlet connections provide easy installation and high flow rates up to 20 gallons per minute (GPM)/75.7 liters per minute (LPM) to meet the needs of residential and light commercial applications. The innovative Sanitary Quick Change (SQC) design, an industry first for this application, allows for fast and easy cartridge change-outs without having to contact the filter media or the need for a filter wrench. The AP904 is manufactured with a head assembly that includes an integral mounting bracket. The 304 stainless steel head can be installed on existing copper pipes in the home. It consists of a corrosion resistant material that provides long service life and won't affect the taste of drinking water. The stainless steel head comes with a 25 year warranty for worry-free ownership. The AP904 also includes an electronic countdown timer refrigerator magnet to remind the owner when to change the cartridge.