Operation & Maintenance
Reverse osmosis causes the
concentration of impurities in the
concentrate stream to increase. The
impurities may precipitate (come out
of solution) when their concentration
reaches saturation levels.
Precipitation can scale or foul
membranes and must be
prevented. Check your feed water
chemistry. Pre-treat the water and/or
reduce the system recovery as
required. If necessary, consult with a
Crane Environmental service
representative for pre-treatment
recommendations.
OPERATION OF OPTIONAL
FEATURES
Prefilter Pressure Gauges:
These gauges measure the feed
water pressure when it enters and
exits the pre-filter housing. A
pressure differential of 10 % or more
on the two pressure readings
indicates that the pre-filter needs to
be replaced. For example, if inlet
pressure is 40 psi, the filter should
be changed when the outlet
pressure is 36 psi or below.
Product Water (Permeate)
Flow Meter (pointer 8 on FIG. 3
and 4) and Waste Water
(Concentrate) Flow Meter
(pointer 7 on FIG. 3 and 4):
These flow meters indicate the flow
rates of permeate and concentrate
water. The measurements, when
added together, also indicate the
feed water flow rate, if the system is
not equipped with waste recycle.
Waste Recycle Valve (pointer
9 on FIG. 3 and 4):
This valve allows you to recycle
some of the concentrate water back
to the feed of the pump. This will
increase the recovery of the EPRO
system. An optional waste recycle
flow meter allows you to measure
how much concentrate is recycled.
THE AMOUNT OF WASTE WATER
RECYCLED IS LIMITED BY THE TDS
OF THE FEED WATER.
CAUTION: Excessive recycling
may cause premature fouling or
scaling of the membrane.
Low Pressure Reverse Action
Switch (normally offered on the
EPRO-150 to 1200):
The reverse action switch shuts off
the EPRO system when the feed
water pressure drops too low for the
system to function properly. This
prevents damage to the pump. The
system restarts automatically when
pressure is restored. If you notice
the pressure fluctuating, and the
system cycling off and on
repeatedly, turn the system off and
ensure that proper feed flow and
pressure are available to the system.
Low Pressure Shut-Off Control
Box (normally offered on the
EPRO-1500 to 8000):
This option consists of an electrical
control box with a low-pressure
protection circuit, level control
connections, pre-treat lockout
connections, and an on/off switch.
The low-pressure shut-off switch can
EPRO 150-8000 O&M MANUAL Rev.04/03 Page 23 of 55
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