Light Duty RO Showing the single result Default sorting Sort by popularity Sort by latest Sort by price: low to high Sort by price: high to low Light Duty Residential & Commercial Reverse Osmosis The GRO & ES Series systems are light duty reverse osmosis systems designed to provide high-quality water for residential and commercial applications at a low cost. Systems range from 150 to 9600 GPD, 0.57 to 36.34 m3/d. Select Options