GB
(Figure 1-2)
Membrane Cleaning
The membrane does not have to be cleaned regularly. However, even in normal operation it can
eventually become dirty or fouled with biological growth and particles which are small enough to
pass through the strainer.
This build-up on the surface of the membrane can cause the freshwater flow rate to be low or the
operating pressure to be high. The most likely symptom will be discharge of seawater from the
relief valve on the pump body, because of higher-than-normal operating pressure.
Under the above circumstances, the membrane should be cleaned as described below. Use
Katadyn’s Membrane Cleaning Kit, article number 8013369, which consists of a special mem-
brane-cleaning housing and cleaning agents.
Two types of cleaner are provided with the kit – alkaline and acid. The alkaline cleaner is used to
remove biological fouling, oil, or dirt; the acid cleaner is used to remove mineral scaling. Cleaning
with just the alkaline cleaner will usually restore the membrane’s performance. However, if low out-
put or higher-than-normal pressure continues, the acid cleaner should also be used.
The procedure is the same for both cleaners. Use the alkaline cleaner first, following the procedure
below. If the acid cleaner is also required, flush the system and repeat the procedure with it.
Membrane
Cleaning Housing
Reject brine line is
bypassed
Freshwater output
line is bypassed
Membrane
Cleaning Solution
(in large pail)
Discard discharge
water for 30 sec,
then insert hose into
cleaning solution pail
as shown
