4-STAGE RO SYSTEM – MODEL EWR 4075 U.S. Metric Membrane Production1 75 ± 7 gpd (283 ± 26 lpd) Membrane TDS Reduction1 96.6% minimum 96.6% minimum System Production2 45 gpd 170 lpd TDS Reduction2 97.5%+ typical 97.5%+ typical Maximum TDS 1000 ppm 1000 ppm Maximum water hardness @ 6.9pH 10 gpg 2.64 gpL Maximum Chlorine in water 3.0 ppm 3.0 ppm Supply water pH limits 4-10 4-10 Drain (reject water) Flow 3-5 x product flow 3-5 x product flow Empty Storage Tank Precharge 5-7 psi air 35-48 kPa air Storage Tank Capacity2 4.0 gallons 15 liters Supply water pressure limits 40-100 psi 280-689 kPa Supply water temperature limit 40-100⁰ F 5-40⁰ C Efficiency3 19% 19% Recovery 4 30.6% 30.6% Specifications – Qualified System Performance Because the performance of a Reverse Osmosis Membrane is highly dependent upon pressure, temperature and TDS, the following should be used for comparison purposes only. 1. Industry standards measure RO Membranes performance with no back pressure on the product water, at 60 psig (414kPa) and 77°F (25°C). Further conditions on the above are 250 ppm TDS and a 30.6% recovery rate. Production rate and TDS reduction figures are for a new Membrane that has been rinsed for 24 hours. The production rate of a new Membrane can decrease by 10% per year or more, depending upon the scaling and fouling tendencies of the FeedWater. 2. Measured at 50 psi, 77°±2°F, and 717 mg/l TDS per NSF/ANSI Standard 58. 3. Efficiency rating means the percentage of the influent water to the system that is available to the user as reverse osmosis treated water. Under operating conditions that approximate typical daily usage. 4. Recovery rating means the percentage of the influent water to the membrane portion of the system that is available to the user as reverse osmosis treated water when the system is operated without a storage tank or when the storage tank is bypassed. 11
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