3M no longer offers this product, however, Aquapure Water Conditioning offers a very similar product at the following links:
When you are looking to replace your water system cartridge, you seek a promise of durability and hassle-free performance but all options cannot rise to this expectation. The Aqua Pure AP814 replacement cartridge is a large-diameter cartridge and perfectly fits the bill for being a safe, sensible choice. It uses a nominal 50-micron cartridge that is suitable for most water conditions. It is compatible with model AP801/AP801-1. It has a reasonably good flow rate of 20 gpm - 28 gpm (65.7 lpm - 105.9 lpm). The cartridge fits all conventional housings and whole house filtration systems like AP801 and AP801-1.5. The pricing on display is for one cartridge. It reduces sediments from drinking water. It is a large-capacity cartridge with an enviable lifecycle. The temperature range is from 40 F - 100 F (4.4C to 37.8C). The pressure range is from 25 psi - 125 psi (172 kPa - 862 kPa).