SpectraPure
®
SpectraPure
®
Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
11
CARBON BLOCK PREFILTER REPLACEMENT:
For maximum contaminant removal and long membrane life, periodically test for the presence of
chlorine in the waste water stream. The Carbon prefilter must be changed when more than 0.1 ppm
of chlorine is detected.
Materials Required:
0.5 micron Carbon Block Filter (CF- 0.5 -20), Filter Wrench, Chlorine Test
Kit (TK- CL-10-KIT)
Procedure:
(SECOND FILTER ON LEFT WHEN FACING SYSTEM)
1.
Perform steps 1-5 on page 10.
2.
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, eventually they will begin to deteriorate. Normally, the conductivity of
the permeate water will increase as the membrane ages. By comparing the difference
in 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 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 readings.
In order to accurately determine the condition of the RO Membrane, a conductivity meter capable
of reading the tap water conductivity and the permeate water conductivity should be used. Using
this 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 approximately 1:1. (NOTE: The pressure gauge should indicate a pressure
reading of 100 PSI during this 15-20 minute test period.)
Procedure:
1.
Read the Tap Water conductivity and record the reading. ___________
2.
Read the Permeate Water conductivity and record the reading. ___________
3.
Use the two reading to apply them to the calculation below:
4.
The general rule is that you should replace your Reverse Osmosis (RO) Membrane when
the % of rejection falls below 96%.
(X - Y) = Z
% REJECTION
BY MEMBRANE
TAP WATER TDS = X
=
RO WATER TDS = Y
X
EXAMPLE: (500 - 20) = 480 / 500 =
0.96 (96% rejection)
