GrowMax Water Power Grow 500 Reverse Osmosis Water Filtration System + Deionization EC Eliminator Kit, 150 GPDEliminate Up To 95% of Salts, Heavy Metals, & Up To 99% of Chlorine Three stage RO system designed and engineered specifically for indoor Hydroponic growers and outdoor growing. Eliminate up to 95% of salts and heavy metals and up to 99. 9% of chlorine. Low EC water = more nutrients for your plants! The POWER GROW 500 Garden Reverse Osmosis water system is capable of reducing up to 99% of most contaminants. This system is designed for use with