SpectraPure
®
SpectraPure
®
Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
12
CARBON BLOCK PREFILTER REPLACEMENT:
For maximum contaminant removal and long membrane life, the Carbon prefilter must be changed when the Chlorine
Test Kit shows more than 0.1ppm of chlorine in the waste water stream.
Materials Required:
0.5 micron Carbon Block Filter (CF- 0.5 -10), Filter Wrench, Chlorine Test Kit (TK- CL-10-KIT)
Procedure:
(SECOND FILTER ON LEFT WHEN FACING SYSTEM)
1. Turn off water supply to the system.
2. Using the provided filter wrench, remove the first housing on the left. Unscrew it counterclockwise as
viewed from the bottom.
3. Remove the old filter and discard.
4. Thoroughly wash the housing with a mixture of hot soapy water and a few teaspoons of household
bleach. Rinse well with clean hot water.
5. Install the new prefilter into the housing, Screw the housing back onto the assembly, and
hand tighten
only
.
NOTE: Do not use filter wrench to tighten housings. Over-tightening will damage housings and
void your warranty.
6. Turn on system’s water supply and check for leaks.
REVERSE OSMOSIS MEMBRANE REJECTION 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 TDS and the RO water TDS, the
“percentage rejection” of the RO membrane may be calculated and the resultant value may then be used to determine
the condition of the membrane. In this way, the operator will know when the membrane needs to be replaced.
Membrane failure will be indicated by a reduction in the percentage rejection which will be determined by calculating
the differential between the input and output TDS readings.
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 left-hand (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 2:1. (NOTE: The
pressure gauge should indicate a pressure reading of 80 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” position and read the Tap water conductivity, then record the reading
________ .
4. Next, slide the switch the to right “OUT” position and read the Permeate water conductivity, then record the
reading ________.
5. Use the two reading to apply them to the calculation below:
(X - Y) = Z
% REJECTION
BY MEMBRANE
TAP WATER TDS = X
=
RO WATER TDS = Y
X
EXAMPLE: (500 - 20) = 480 / 500 =
0.96 (96% rejection)
6. The general rule is that you should replace your Reverse Osmosis (RO) Membrane when the % rejection falls
below 95%.
