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The amount of total dissolved solids rejected by the system is expressed as a percentage. A 90% rejection means that
90% of the dissolved solids have been removed from the feed water by the system. To calculate the percent rejection, use
the following equation:
Where Feed TDS is the total dissolved solids content of the water going into the system, and Product TDS is the total
dissolved solids content of the high quality product water. The GBE RO controller displays the Product TDS (TDS OUT)
on the information screen. The feed 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,
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. The GBE RO controller displays the Feed Flow (FFLOW) and Product Flow (PFLOW) on the
Information screen. The Recovery is also displayed on an Information screen. Use the following equation to calculate
percent recovery:
CAUTION!
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 10. A water softener is typically
used for pretreatment.
Property
Turbidity (NTU)
pH*
Chlorine (ppm)
Total Dissolved Solids (ppm)
Temperature (°F)
Silt Density Index
Iron (ppm)
*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.
Culligan® Series G1 Reverse Osmosis
122
(Feed TDS - Product TDS)
(Feed TDS)
600-24
600
Product Water Flow Rate (PFLOW)
Feed Water Flow Rate (FFLOW)
An understanding of rejection/recovery percentages and temperature compensa-
tion 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.
Minimum
Table 10.
x 100 = % Rejection
x 100 = 96% Rejection
x 100 = % Recovery
0.0
6
0.0
50
33
0.0
0.0
Feed water limits.
Maximum
1.0
11
0.1
2500
100
5.0
0.1
Cat. No. 01021713
122
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