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19
types of cleaners
! Always flush well with clean water between processes if performing both alkaline
and acid cleaning. The following directions apply for both types of membrane cleaners:
1. Lift the lever on the cleaning valve on the pump to place it in its “clean” or “up” position
(see
Figure 12
).
2. Discard any dirty seawater in the prefilter assembly. Clean the housing and install a clean
filter.
3.
Fill a clean plastic container or bucket with one gallon (approximately 4 liters) of clean
water. Freshwater is preferable, but clean seawater may be used if freshwater is not
available. (
Caution:
Never use chlorinated freshwater. This may damage the membrane.)
4. Prepare the cleaning solution according to the instruction on the cleaner container. Do not
mix
Acid Cleaner
and
Alkaline Cleaner
. Stir until the cleaner is completely
dissolved. The water should be warm, but not over 120° F (49° C).
5. Turn the lever on the prefilter 3-way valve to the alternate intake position. Run the 3/16"
alternate intake hose with the strainer attached into the container of cleaning solution.
6.
Disconnect the reject brine water hose from its drain (or use a separate length of hose) to
route the reject brine water back into the container of cleaning solution during the
following procedure.
7.
Turn on the watermaker. Discard any solution coming from the reject brine hose for about
30 seconds. Then run the reject brine water hose back into the container of cleaning
solution to allow recirculation of the cleaner.
8.
Continue to run the watermaker for about 15 minutes, to assure that the cleaning solution
is well circulated through the pump and membrane.
9. Turn off the watermaker and allow the membrane to soak in the cleaning solution for 5 to
10 hours, or overnight. For severe fouling, repeat steps 8 and 9 of this procedure.
10. When the soaking is finished, remove the reject brine hose from the cleaning solution
container and run the watermaker again. Discard the first pulses of the reject brine water.
When the reject brine flow becomes cleaner, return the reject brine hose to the cleaning
solution container for recirculation.
11. Continue to run the watermaker and recirculate the cleaning solution for another 30 to 60
minutes
12. When cleaning is complete, turn off the watermaker. Reconnect the reject brine hose to its
normal drain location.
13.
Remove the alternate intake hose and strainer from the cleaning solution and place them
into a container of clean, warm (non-chlorinated) freshwater. If freshwater is not
available, clean seawater may be used if its temperature is above 68° F (20° C).
14.
Turn on the watermaker and flush warm water through the system for 5 minutes.
If the watermaker will be stored for more than a week (three days in warm climates), it should be
treated with the membrane preservative solution.