The 3M DP390 Cartpak is a filter replacement kit for the 3M DP390. It reduces cysts, bacteria, chlorine, sediment, and scale build-up. The DP390 Cartpak kit includes three HF90 cartridges and one HF8-S cartridge. These 3M filters have a combined flow rate of 15 gallons per minute and an operating capacity of 162,000 gallons. The HF90 replacement cartridges have a 0.2 micron rating and carbon block media for the reduction of chlorine taste and odor, sediment, cysts, and bacteria. The HF8-S cartridge provides scale inhibition.