3
SECTION II. SPECIFICATIONS
TABLE A – QUALIFIED SYSTEM PERFORMANCE
Because the performance of an RO Membrane is highly dependent upon pressure, temperature, and TDS, the
following should be used for comparison purposes only.
U.S.
Metric
Membrane Production
1
14 ± 2 gpd
45-60 lpd
Membrane TDS Reduction
1
90% minimum
90% minimum
Warm Climate System Production²
9.5 ± 2 gpd
28-44 lpd
Warm Climate TDS Reduction²
85%+ typical
85%+ typical
Cold Climate System Production²
6 ± 1 gpd
19-26 lpd
Cold Climate TDS Reduction²
85%+ typical
85%+ typical
Drain (reject water) Flow
3-4 x product flow
3-4 x product flow
Empty Storage Tank Precharge
5-7 psig air
35-48 kPa air
Storage Tank Capacity
3
1.8 gallons
6.8 liters
1
Industry standards measure RO Membranes performance with no back pressure on the product water, at 65 psig (450kPa) and 77°F (25°C). Further
conditions on the above are 500 ppm TDS and a 15% 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 Feed Water.
2
Actual capacity measured at 55 psig, 77°F, and 750 ppm TDS.
3
Measured at 50 psig inlet pressure and 7 psig tank precharge.
TABLE B – RECOMMENDED OPERATING LIMITS FOR FEED WATER
Specifications
C.T.A. Membrane
Water Pressure
40-100 psig (280–690 kPa)
TDS
1500 ppm (also mg/l) max.
Temperature 40–85°F
(4–29°C)
pH 5–8.5
Hardness
Less than 10 gpg or soften
Iron
Less than 0.1 ppm (also mg/l)
Manganese
Less than 0.05 ppm (also mg/l)
Hydrogen Sulfide
None
Chlorine
0.2–2.0 ppm (also mg/l)
Bacteria
Must be potable**
NOTE: Bacteria can damage a C.T.A. Membrane. Chlorinated feed water is necessary for membrane protection.
**DO NOT USE WITH WATER THAT IS MICROBIOLOGICALLY UNSAFE OR OF UNKNOWN QUALITY, WITHOUT
ADEQUATE DISINFECTION BEFORE OR AFTER THE SYSTEM.