Purenex Multipure Aqua RO System - Manual (Page 14)

6 Month System Maintenance - continued
IMPORTANT:Follow steps 9, 10 and 11 to flush carbon particles from prefilters so as not to clog the flow
restrictor which could then foul the membrane.
Step 9 After changing pre-filters, disconnect the green tube at the “out”
side port of the RO pre-filter module. See page 11, step 39 for
instructions on how to disconnect tubing.
Step 10 Use the clear tubing fromthe original installation and flush out all
carbon particles from the carbon prefilters. (Refer to page 11,
steps 36 - 39 for flushing instructions.) As soon as the water runs
clear, turn off the incoming water and re-attach the green tube
between the “out” connector of the RO Pre-filter module and the
automatic shut-off valve (Item #22).
Step 11 Turn on the incoming cold water. Check the system for leaks and
tighten any fitting as necessary. (Check over the next 24 hours to
ensure no leaks are present).
Step 12 Open the valve on the RO faucet tank.
NOTE: Retain the clear tubing for flushing the RO pre-filters in the future.
Inspect the reverse osmosis system periodically to ensure the unit is functioning properly.
14
Nitrate/Nitrite Testing
The RO system is acceptable for treatment of influent concentrations of no more than 27 mg/L
nitrate and 3 mg/L nitrite in combination measured as N and is certified for nitrate/nitrite reduction
only for water supplies with a pressure of 280 kPa (40 psig) or greater.
It is recommended that user’s water be sampled and tested for nitrate/nitrite at least once a year to
confirm that the RO system is performing its function.
Included in this shipment is a nitrate/nitrite test strip. Within one year of installation of the RO
System you should test your water. Just dip the strip in the treated water, following the instructions
included with the test strip.
If the levels of nitrate or nitrite exceed the influent concentrations shown above, the RO membrane
should be replaced.