The 3M Aqua-Pure whole house standard diameter water filter drop-in replacement cartridge AP1001 for the AP100 & standard and large diameter stainless steel housing series, is a good choice in water filtration. This standard 2.5 in diameter drop-in cartridge is manufacturer tested and verified to reduce sediment down to 1 micron nominal. Its rigid construction from our proprietary polypropylene manufacturing process, helps to eliminate "unloading" of sediment due to variances in water pressure, sometimes referred to as water hammer. To maximize system performance and efficiency, regularly scheduled maintenance including replacement of the filter cartridges at the required interval, at the rated capacity, or sooner if a reduction in water flow occurs is required. Filter life is dependent on actual use and incoming water quality. 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 Aqua-Pure 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. This translates to 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.