7
of service, allowing membrane to “break
in”.
(g) Check for production as follows:
Using a measuring cup, or measuring device
marked in fluid ounces, measure the RO water
production for 1 minute. This will give you the
production in ounces for one minute.
(Ounces per minute X 1440 ÷ 128= gallons per 24 hours)
Water temperature and water pressure will vary
the production. See production conversion charts
on Specification Sheet.
(h) Close the ball valve feeding into the
membranes and reconnect the ¼” blue line.
(i) Open ball valve feeding into membrane and
allow unit to fill storage tank. Depending on
water temperature, water pressure and size
storage tank, the time will vary to fill the
storage tank completely. Allow 12 to 24
hours to fill tank the first time. Check for
leaks.
System Disinfecting
If System is used to supply RO drinking water
for human consumption disinfection is
recommended. System should be disinfected
at least once every 12 months.
(a) Storage tank should be completely filled
before disinfecting.
(b) Drain RO water from all post treatment
equipment at the furthest point down stream
from the storage tank. This will flush any
particles from the final filters and lines.
(c) Shut off the incoming water supply to RO
unit and close faucet down stream of RO.
(d) Remove all filter cartridges fro m post
treatment housings down stream of WM.
(e) Add 1 teaspoon of hydrogen peroxide to all
filter housings down stream of RO unit.
Reconnect to filter housings without the
cartridge.
(f) Add 1 teaspoon of hydrogen peroxide to
storage tank, by removing tank tee from the
storage tank or by adding hydrogen peroxide
to the line feeding into the storage tank.
(g) Turn on water supply to RO unit and allow
WM to produce water for 2 hours.
(h) If you have ball valve after the storage tank
or before the post filter housing you ma y
shut the RO water supply off at that point.
(i) Open faucet at the furthest point from
storage tank to depressurize Ro water lines.
Add post filter cartridge back to its filter
housings.
(j) Close faucet and open any valve that may
have been closed. Any hydrog en peroxide
still in the storage tank or lines will be
removed by the final polishing filter or will
break down to oxygen and water.
MAINTENANCE Schedule
Replacement Pre-filter for WM-120:
1
st
Stage: Part #WP 304003 Sed-20” -5-micron
2
nd
Stage: Part #WP 201011 Carbonblock-20” -
5m
3
rd
Stage: Part #WP 201011 Carbonblock-20”-
5m
WM-120 pre-filters should be changed once
every 6 months or sooner depending on
incoming feed water conditions or when the
outlet pressure gauge form pre-filter drop
below a reading of 40 psi.
WM-120 replacement membranes:
Part #WP 110012 MEM -TFM-75 gpd
WM-120 membranes depending on water
conditions should be replaced once every 12 to
24 months.
Changing Pre-filters
1.
Close the ball valve on the inlet side of
WM-120.
2.
Close ball valve feeding into the RO
membranes.
3.
Open flush ball valve and drain water into a
pail or drain.
4.
Unscrew the blue 20” filter housing by
turning counter clockwise. Note: A filter-
housing wrench may be need.
5.
Drain and remove filter cartridges from
housing. Dis card used filter cartridges.
DO
NOT discard filter-housing o-ring.
6.
Clean filter housing with warm soapy water.
Rinse with clean water.
7.
Clean and lubricate filter-housing o-ring
with K-Y Jelly or silicone. Do not use a
petroleum-based lubricant.
8.
Insert new filter cartridges into the
appropriate housing.
9.
Follow normal start up procedures.
Watts Pure Water
