GrowMax Water RO + DI System EC Eliminator (150 GPD)The GrowMax Water Filtration EC Eliminator Reverse Osmosis + Deionization System (RO DI) filters up to 150 gallons per day 000 ppm 0. 0 EC pure water. GrowMax Water high efficiency Reverse Osmosis Systems increase the effectiveness of your nutrient solution and fertilizers helping you grow healthier, higher yielding plants, flowers, gardens, fruits, and vegetables. The GrowMax 150 GPD RO System is a three stage reverse osmosis filter system. It