The Rainshow'r RCGG Replacement Filters for Gard'n Gro Garden Hose Filter System includes 26 oz of KDF-55 and 2 oz of energized crystal to convert chlorine into harmless and soluble chloride thereby making the water safe for plants in your garden. It effectively removes over 85% of the chlorine from garden hose water which in turn help maintain proper bacterial balance in the soil. Its filter system come in an easy to install clear polycarbonate "pop-in" cartridge. With a capacity to process a minimum of 20,000 gallons of water, it helps to enhance plant growth by removing harmful chlorine from water. The Rainshow'r RCGG includes 2 cartridges.