Cuno SQC Pro User Manual

Reverse Osmosis drinking water appliances contain treat-

ment components that are critical for the effective reduction of
Total Dissolved Solids (TDS) as well as inorganic chemical
contaminants.  Water Factory Systems

®

strongly recommends

that the user test the water periodically (every six months mini-
mum) to verify that the appliance is performing satisfactorily.
Some models have a Percent Rejection (PR) Water Quality
Monitor to provide the user with a means to test the water at
any time.  If a PR Monitor is not used, your dealer will offer a
bi-annual water testing service.  Routine maintenance is nec-
essary in the form of prefilter, postfilter, and membrane
replacement, based on the following guidelines:

•

Sediment, Carbon Prefilters, and Carbon Postfilters:  
Change every six months to one year depending on the 
feedwater quality.

•

RO Membrane:  Change it as required based on a built-in 
Percent Rejection (PR) Water Quality Monitor. A bi-annual 
testing service will be offered by your dealer if a (PR) 
Monitor is not used.  The recommended maximum service 
life is 36 months.

The life of the prefilter cartridge generally depends on the

local water conditions (i.e., dirt, rust and/or chlorine levels)
while the life of the postfilter cartridge(s) is generally deter-
mined by the length of service.

•

Every six months to one year, based upon your dealer's 
recommendation and knowledge of the local water 
conditions.

•

A noticeable decrease in water production is an indication 
that the prefilter requires changing.

•

As a rule, private wells require more frequent sediment 
prefilter changes while softened feed water usually requires 
only yearly replacement.

•

Recommended maximum sediment or sediment/ carbon 
prefilter service life is one year.

•

If the filter is being used to control tastes and odors, 
replace it every year.

•

If the filter is being used to reduce chloramines, change it 
every six months.  For critical applications such as 
aquariums, base the filter change on periodic chloramine 
(combined chlorine) tests.

•

If the filter is being used to meet standards for a regulated 
organic chemical contaminant, then cartridge replacement 
should be based on a monitoring program established with 
a public health agency.

Lift up on the faucet handle to drain the tank. Unplug the 
transformer.  Close the feedwater tapping valve.  Wait five 
(5) minutes for the purification assembly to completely 
depressurize.

Twist the filter cartridge 1/4 turn clockwise so that the ears 
on the cartridge are able to disengage from the head.  
Firmly pull the cartridge from the head.  It may be 
necessary to twist the cartridge slightly from side to side to 
help free it.

Remove the new filter cartridge from its sanitary sealed 
wrapper.  (Double check to see that it is the correct 
replacement by comparing the labels.)

Using tap water, food grade silicone lubricant or glycerin, 
wet the o-ring seals to make cartridge insertion easier.

Line up the cartridge ears, insert the cartridge and push it 
into the head until it is fully seated.  Twist the cartridge 1/4 
turn counter-clockwise to lock it into place.

Open the feedwater tapping valve, plug the transformer in 
and carefully check for leaks.

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