52 Culligan® Series E2 Plus Reverse Osmosis
52 Cat. No. 01023094
(Feed TDS)
x 100 = % Rejection
Where Feed TDS is the total dissolved solids content of the water going into the system, and Product TDS is the total dis-
solved solids content of the high quality product water. The feed and product TDS needs to be measured with a handheld
meter.
For example, if the Feed TDS is 600 ppm and the Product TDS is 24 ppm,
x 100 = 96% Rejection
NOTE Numbers used in these examples might not reflect those of your unit.
The amount of high quality water recovered for use as a percentage of the water fed into the reverse osmosis system is
called percent recovery. Product and feed flow rates are shown on the rotameters. Use the following equation to calculate
percent recovery:
Product Water Flow Rate (PFLOW)
Feed Water Flow Rate (FFLOW)
x 100 = % Recovery
CAUTION! An understanding of rejection/recovery percentages and temperature compensation
is essential for monitoring and evaluating the performance or condition of the reverse
osmosis system. DO NOT operate the system before becoming familiar with these
concepts.
Temperature Compensation
As the feed water temperature decreases so will the product water production. The rated product flow (gallons per minute,
gpm) as shown for the various models is based upon the feed water temperature equal to 77° F.
Feed Water Limits
Before starting the installation, verify that the feed water meets the limits shown in Table 5. A water softener is typically
used for pretreatment.
Property Minimum Maximum
Turbidity (NTU) 0.0 1.0
pH* 6 11
Chlorine (ppm) 0.0 0.1
Total Dissolved Solids (ppm) 50 2500
Temperature (°F) 33 100
Silt Density Index 0.0 5.0
Iron (ppm) 0.0 0.1
Table 5. Feed water limits.
*Short term cleaning is acceptable for pH ranges between 2.0/12.0. Additional treatment is required when chloramines are
present and the pH levels exceed 9.0.
NOTICE In some applications, a water softener is not required. Consult an independently operated Culligan
dealer for further information on these special applications.
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