Hydrologic ARCS Heavy Metal Reduction CartridgeARCS Heavy Metal Reduction Cartridge is built to reduce heavy metals in the water like copper, lead, zinc, etc. and promote well being. It serves as an excellent replacement for copper zinc ACRS COPZIN. The cartridge is also bacteriostatic, which means it hinders the growth of bacteria within the filter. You can use it to treat your water supply. It fits well into standard RO filter housing. Make sure you replace it after 10,000 gallons of use.