3M Aqua-Pure Whole House Replacement Water Filter - Model AP811 Reduces particulates as small as 25 microns, helping improve water clarity Reduces rust, helping protect laundry and fixtures from red stains Exclusive Micro-KleanTM XL progressive porosity process provides high flow rate for up to six months High capacity filter cartridge is good for larger homes and commercial applications All parts are manufactured from FDA CFR-21 compliant materials