GrowMax Water 17” Green Coconut Carbon Block Filter - Compatible with HydroLogic Evolution-RO - Case of 25This 17 Green Coconut Carbon Block Filter is compatible with the HydroLogic Evolution Reverse Osmosis System. In water filtration, coconut carbon is preferred over other forms of carbon due to its greater surface area and higher porosity meaning it has superior absorption capabilities. Our Green Coconut Carbon Block filter removes 99% of impurities and VOCs volatile organic compounds) including chlorine, rust, sediment, and silt. Protects your RO