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conditions are not met. You may do so, though this must be accomplished by a combination of
increasing the flow of concentrate to waste and reducing the recirculation valve flow. This, done in
balance, will maintain the overall system pressure. Simply open the concentrate valve to the desired
flow rate and close the recirculation valve until the nominal pressure registers. Using the formula:
% Recovery Rate = Flow rate of Permeate (Product Flow)
Flow rate of Pe Flow rate of Waste
Adjust the concentrate and waste valves until the appropriate balance is met. Once the new balance
has been established you may wish to note the valves position
Section 5: System Maintenance
5.1 Changing pre-filter cartridges
The pre-filter cartridge should be changed, as a rule of thumb, at least every month, weekly in heavy
use applications. It is critical that this be done to ensure that pre-treatment cartridge allow necessary
flow and that suspended particulate is removed from the feed water.
To change the cartridge, turn off the system’s power and as a safety precaution, close the water
supply to the unit. Repeat Step 3.7.1 from the installation instructions above. Thoroughly flush and
clean the filter housings while they are disassembled. Always use Waterite factory cartridges as
replacements.
5.2 Monitoring your system performance
Your system will be operating at its peak performance after about 48 to 72 hours of operation. You
should develop a daily log to track line pressure, system pressure, feed water TDS, permeate TDS,
permeate flow rate and waste flow rate. This will allow you to see any developing performance
trends or alert you to system changes that will require you to intervene. It will also be helpful for
your dealer or Waterite technical personnel to have this information available to help troubleshoot
your system, should it become necessary. The table provided in Section 9 of this manual will help
you get started.
5.3 Cleaning your membrane elements
As your membranes begin to age, they will gradually lose some output performance. This is normal
and may result in an overall permeate flow loss of 5% after about 1 year. Your membranes may
also eventually begin to lose production due to organic fouling or mineral scaling in their interior.
Symptoms of this may be continuously falling production rates or elevated TDS levels in the product
water.
DO NOT ATTEMPT TO OPERATE THE SYSTEM ABOVE SPECIFIED PRESSURES TO
COMPENSATE FOR OUTPUT LOSS – THIS WILL ONLY ACCELERATE THE PERFORMANCE
LOSS AND MEMBRANE ELEMENT DEGREDATION.
T
otal
D
issolved
S
olids may be measured by a professional or by use of a simple hand-held TDS
monitor. These are available from your dealer. On critical application, a laboratory analysis should
be done on a regular basis.
Pocket TDS meter
(Waterite P/N CD600)
The membrane element life will range from 1 to 5 years, depending on the quality of the raw water.
See (section 3.7.3) for membrane removal and installation instructions.
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