Watts Premier WP-4V Installation, Operation And Maintenance Manual - Membrane Replacement
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Membrane Replacement
Membranes have a life expectancy between 2 and 5 years, depending on the incoming water conditions
and the amount of use of the RO system. This reverse osmosis membrane is critical for effective reduction
of total dissolved solids. The product water should be tested periodically to verify that the system is
performing satisfactorily.
Normally, a membrane would be replaced during a semiannual or annual filter change. However, if at
any time you notice a reduction in water production or an unpleasant taste in the reverse osmosis water,
it could be time to replace the membrane. A water sample may be sent Watts Premier for a free test
or a TDS (total dissolved solids) monitor can be purchased from Watts Premier to test the incoming and
reverse osmosis water at home.
To send a water sample, using 2 clean containers put ½ cup of tap water in one
container and ½ cup of reverse osmosis water in 2nd clean container. Clearly
mark each container. Watts Premier will test the water and call or mail you the
Step 1
Step 2
Remove the membrane vessel on top of the unit by turning the vessel
counter clockwise to loosen.
Turn off the cold water supply and open the RO faucet to drain the
tank.
Annual sanitizing of unit is recommended. Turn off incoming water supply. If sanitizing your
RO remove sediment & carbon filters from filter housing, as well as the RO membrane before
sanitizing.
Open Membrane vessel and remove the membrane from the membrane vessel. Replace
empty membrane vessel onto the unit.
Leave filters out, replace the last two (of three) empty filter housings (hand tight) onto unit.
Measure & pour either 1/2 cup of 3% hydrogen peroxide or 2 tablespoons of common
household bleach into the 1st filter housing and hand tighten onto unit.
Turn on incoming water supply. Wait 1 minute for the unit to pressurize. Turn on the RO
faucet and let the water run for 30 seconds then turn off the RO faucet . Let the unit rest for
2 minutes. Open RO faucet again and let the water run for 5 more minutes.
Turn off incoming water supply and make sure tank is completely drained. Refer to 6 months
filter change to now install new filters. Make sure to insert RO membrane back into the
manifold vessel.
Open membrane vessel and insert the RO membrane back into the manifold, making sure not
to kink the O-ring. Tighten the membrane vessel back on the RO unit (Refer to “Membrane
Replacement” below for details).
Turn on incoming water supply. Let tank fill for 2-3 hours. Check for leaks and drain tank
one last time.
Annual Maintenance
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7