AQUA CREST AP810 Whole House Water Filter Replacement for 3M® Aqua-Pure AP810, AP801, AP811, Whirlpool® WHKF-GD25BB, WHKF-DWHBB, 5 Micron, 10" x 4.5", Well & Tap Water Filter, Pack of 3Efficient Filtration: AQUA CREST whole house water filter adopts food grade material to remove large particles and sediments larger than 5 microns in diameter effectively. Long lasting : Enjoy fresh water by replacing your filter every 6 months, under average water quality, poor water quality will shorten the service life of the filter. To ensure the filtering effect, please replace your filter in time. Replacement Model: AP801, AP801 1. 5, AP801 1. 5