SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
®
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CARBON BLOCK PRE-FILTER REPLACEMENT:
For maximum contaminant removal and long membrane life, the Carbon pre-filter must be changed when the system fails
to maintain the pre-set pressure of 100 PSI.
Materials Required:
0.5 micron Carbon Block Filter (CF-0.5-20), Filter Wrench, Chlorine Test Kit (TK-CL-10)
Procedure:
(SECOND FILTER ON LEFT WHEN FACING SYSTEM)
1. Perform steps 1-5 on page 11.
2. Turn on system’s water supply and check for leaks.
REVERSE OSMOSIS MEMBRANE DIAGNOSTICS:
Although RO membranes are capable of maintaining high water quality over extended periods of time they eventually
will begin to deteriorate. Normally, the conductivity of the permeate water will increase as the membrane ages. By
comparing the difference in TDS readings between the Tap water conductivity and the RO water conductivity, the
percentage of rejection of the RO membrane may be calculated and the resultant number may then be used to determine
the condition of the membrane. Thus, the operator will know when the membrane needs to be replaced. Membrane fail-
ure will be indicated by a reduction in the percentage of rejection which will be determined by calculating the
differential between the input and output numbers.
In order to accurately determine the condition of the RO Membrane, a conductivity tester (TDS meter) capable of reading
the tap water conductivity and the permeate water conductivity has been provided with this system. With the assistance
of the first (meter #1) Dual TDS meter, you will be able to easily determine the RO membrane’s condition.
Before performing the diagnostic test on the RO membrane, make sure that the RO system has been “ON” and producing
pure water for a minimum of 10 minutes. Also check the brine (yellow) line to make sure that water is flowing and that the
flow ratio between the brine water and the permeate water is at a ratio that is between 1:1 and 1:2. (NOTE: The pressure
gauge should indicate a pressure reading of 100 PSI during this 15-20 minute test period.
Procedure:
1. Turn on the left side meter by depressing the on button.
2. Locate the meter slide switch on the front of the DM-1 TDS meter.
3. Slide the switch to the left “IN” and read the Tap water conductivity then record the reading ________ .
4. Next, slide the switch the to right “OUT” and read the permeate water conductivity then record the reading
________.
5. Take the two reading and apply them to the calculation below:
6. The general rule to knowing when to replace your Reverse Osmosis Membrane (RO) is if your % rejection is
below 95%
(X - Y) = Z
TAP WATER TDS = X
RO WATER TDS = Y
_______________
X
= % REJECTION
BY MEMBRANE
EXAMPLE: (500 - 20) = 480 / 500 =
0.96 which is 96% rejection
