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Membrane Maintenance
Membrane filters have a life expectancy of 2 to 5 years, depending on the incoming water conditions and
the amount of use of the RO system.
If at any time you notice a reduction in water production or a change in the taste of the RO water, it could be
time to replace the membrane. A sample of water may be sent to Watts for a free test or a monitor can be
purchased from Watts to test RO water.
To send a water sample include ½ cup of tap water and ½ cup of RO water in a water tight clean c o n -
tainers. Clearly mark each container. Watts will test the water for TDS rejection and hardness
and contact you with the results.
Step 1
To change the membrane, use a 5/8" wrench to
remove the nut from the cap side of the membrane
housing (the end with only one elbow). Remove the cap
from the white horizontal membrane housing.
Note: To assist with the removal of cap a double sided wrench canbe purchased from
Watts Premier.
Step 2
Using a pair of pliers, grip and pull firmly on the membrane filter to
remove it from the housing and discard the membrane.
Step 3
Unwrap new membrane filter and lubricate the o-rings with water
soluble lubrication such as KY Jelly® . Insert the end with the
two black O-rings into the membrane housing.
Step 4
Once membrane filter 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.
Note: To be properly seated the tip of the membrane filter must
be below the housing edge.
Step 5
Screw the membrane filter housing cap back on securely.
Step 6
Connect the green tube back to the membrane cap fitting.
Step 7
You must change the flow restrictor each time you
change the Membrane filter. Replace the existing flow
restrictor with the new one by removing the White
compression nuts. Make sure the arrow is pointing
toward the check valves and hot water line fitting.
Step 8
Follow Start Up procedures on page 8.
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