REVERSE OSMOSIS SYSTEMS RO 4... /E /EL - INSTRUCTIONS MANUAL
s.r.l.Milano - ITALY
Page 20 of 25
ro4e_mi-r10.doc -
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7. Maintenance
Refer to special manuals of each components for maintenance operations.
7.1. Periodical
monitoring
The system requires, as periodical maintenance, the cleaning or replacing of the cartridge of
filters .
Special instructions :
•
check daily the values of pressure and flow rate of the water; they have to comply with
ones stated by the manufacturer.
•
be sure of chlorine content in raw water : it is
STRICTLY
required that the contents of
chlorine in raw water must be
lower than 0.1 ppm;
higher quantity can seriously damage
the membrane.
•
replace the 5 µm filtering cartridges of the filter F, at least every six months, according to
the quality of raw water or when the inlet pressure decreases (compare pressure gauges
M1 and M2, max allowable pressure drop though the filter is 0.8 bar - 80 kPa). Before the
opening of the filter, switch OFF the main power, and close the inlet shut off ball valve V1;
for refills see the attached special instructions of the filters.
•
replace the RO membranes, when the quality and/or quantity of treated water (permeate)
are not satisfactory any more. Whether the raw water is adequately pre-treated the life of
membranes is usually longer than 3 years (even 5-6 years). Therefore, the life of
membranes depends on the quality of water to be processed.
To re-start the system after the replacement of filters and/or membranes, follow the
directions described at chapter "Starting-up and adjustments”.
7.2. Non-working period
•
Whether a shut-off of the system, longer than one week is expected, it is suggested to fill
the membranes with a preservative solution containing 1% of sodium bisulphite (NaHSO
3
)
in RO treated water.
The preservative is injected into the membranes using an auxiliary tank, the same way
described for the cleaning, but without rinse. The solution is simply drawn by the high-
pressure pump P.
At the re-starting of the system it is required to remove the preservative from
the membranes, the same way described at chapter “Starting-up &
adjustment".
