Step 5
Step 6
Step 7
Step 8
This reverse osmosis system contains a replaceable com-
ponent (the RO membrane) which is critical to the efficien-
cy of the system. Replacement of this reverse osmosis
membrane should be with one of identical specifications
to assure the same efficiency and contaminant reduction
performance.
Membranes have a life expectancy between 2 and 5
years, depending on the incoming water conditions and
the amount the RO system is used. This reverse osmosis
membrane is critical for effective reduction of total dis-
solved solids (TDS). The product water should be tested
periodically to verify that the system is performing satis-
factorily.
Normally, a membrane would be replaced during a semi-
annual or annual filter change. However, if at any time
you notice a reduction in water production or an unpleas-
ant taste in the reverse osmosis water, it could be time to
replace the membrane. Watts recommends replacing the
membrane when TDS reduction falls below 75%.
Step 1
Turn off the incoming water supply to the RO
system.
Open the RO Faucet and allow water to drain
from the tank until it is completely empty.
Step 2
Removing the membrane:
Installing the membrane:
Remove the end cap from the membrane
housing by turning it counter clockwise to
loosen.
You may remove membrane housing from the
holding clips. Using a pair of pliers, grip the
PVC tube of the RO membrane and pull firmly
on the membrane to remove from the housing
and discard.
Lubricate the O-rings on the new membrane
with a water soluble lubricant such as KY
Jelly ®. Insert the end with the two black
O-rings on the PVC tube first into the hous-
ing.
Once membrane has been inserted into the
housing you must take your thumbs and give
a firm push to properly seat the membrane.
Replace membrane housing cap and tighten.
After replacing membrane housing into the
holding clips, re-attach the white tube to the
quick connect elbow fitting on the end cap of
the membrane housing.
Step 9
Step 3
Remove the polishing filter with clips from the
top of the membrane housing.
Step 4
Disconnect the white tube from the elbow on
the end cap of the membrane housing.
Clip the final polishing filter back on to the
membrane housing and follow the Start Up
Instructions on page 10.
Step 10
Membrane Replacement
Summary of Contents for FMRO4G-ERP-75
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