3M Aqua-Pure AP811 Whole House Replacement Cartridge (5618904) $13.42 at Home Depot + Free Shipping

Home Depot has 3M Aqua-Pure AP811 Whole House Replacement Cartridge (Model #5618904) for $13.42 w/ free store pickup.
Notes: the product title & the model number matches AP811; but the picture shows AP810 (blue)