System Specifications; Qualified System Performance; Recommended Operating Limits For Feed Water - Maytag M-550 Operation And Service Manual

For good performance of a Membrane consider the pressure, temperature, pH and TDS. The below Table 1 must be used for
comparison purposes only.
1 Industry standards measure membrane performance with no back pressure on the product water, at 65 PSIG (448 kPa) and
77 °F (25 °C). Further conditions on the above are 250 ppm TDS. 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 if the scaling and
fouling tendencies of the Feed Water increase.
2 Measured at 50 PSIG (345 kPa), 77 °F ± 2 °F, 750±40 mg/l TDS per section 6 of NSF/ANSI Standard 58. 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. 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. This reverse osmosis system contains a replaceable component critical to the efficiency of the system. Replacement
of the membrane should be with one of identical specifications, as defined by the manufacturer, to assure the same efficiency and
contaminant reduction performance.

RECOMMENDED OPERATING LIMITS FOR FEED WATER

NOTE: Chlorine will damage a T.F.C. Membrane. The Sediment/Carbon module is designed to reduce chlorine from the Feed Water.
Make sure to change the filter every 6 - 12 months or more often if the water contains more than 1 PPM chlorine.
6

SYSTEM SPECIFICATIONS

QUALIFIED SYSTEM PERFORMANCE

Specifications
Membrane Production
1
Membrane TDS Reduction
System Production²
Recovery Rating²
Efficiency Rating²
TDS Reduction²
Drain (reject water) Flow
Empty Storage Tank Pre-charge
Storage Tank Capacity
2
Table 1: Qualified System Performance
Do not use with water that is microbiologically unsafe or
of unknown quality without adequate disinfection before
or after the system. Systems certified for cyst reduction
may be used on disinfected waters that may contain
filterable cysts.
Specifications
Water Pressure
TDS
Temperature
pH
Hardness
Iron
Manganese
Hydrogen Sulfide
Chlorine
Bacteria
Table 2: Recommended Operating Limits
U.S.
41 - 53 gallons/day
96% minimum
1
12 gallons/day
30%
14%
90%+ typical
3-5 x product flow
5 - 7 PSIG air
1.7 gallons
T.F.C. Membrane
40 - 100 PSIG (280 - 690 kPa)
2000 ppm (also mg/l) max.
40-100 °F (4-38 °C)
4-11 (optimum rejection at pH 7.0 - 7.5)
Less than 10 gpg (170 mg/l) or soften
Less than 0.1 ppm (also mg/l)
Less than 0.05 ppm (also mg/l)
Must be potable**
Metric
155 - 201 (L/day)
96% minimum
45 (L/day)
30%
14%
90%+ typical
3-5 x product flow
35 - 48 kPa air
6.4 L
None
See note