SG2 Pure Water System Operation and Maintenance Manual - 5
10. RO Only Valve Operation
There is a 2 way wye located on the bottom of your RO
housing. This can be used in several ways.
First, it allows you access to the clean water coming
out of the RO membrane before it is run through the DI
filter. You should periodically test the TDS of this RO
water to assess the health of your RO membrane.
Depending on the TDS of your source water, your RO
membrane may purify the water sufficiently for your
cleaning application (abc recommends that TDS be
at least 10 ppm or below for most window cleaning
applications). If you, as the window cleaner, decide the
RO only water is clean enough for your application,
you can attach your pole tubing directly to the RO only
valve and shut off the flow of water to the DI filter to
preserve the life of your DI resin.
When using a RO membrane, there is a spike of higher
TDS water that passes through the membrane each
time you start using it. Users that wish to avoid passing
this higher TDS water through their DI resin can shut off
the DI side of the wye. Open the RO only side, turn on
the source water, run it for about 10-30 seconds, open
the DI side again and then shut off the RO only side.
Do not shut off both sides of the RO only wye if you are
running a pump, as that could damage the system.
9. Producing Pure Water
Connect your WaterFed® pole to the end of the
production water hose. Open the shut-off valve
between the hose and the pole to allow water to flow
through the pole and wash glass. Do not drink pure
water made from your system.
11. TDS (Total Dissolved Solids) Meter
Total Dissolved Solids are the particles dissolved within
water that can lead to spotting on glass as the water
evaporates. Your TDS meter measured the amount of
dissolved solids by measuring the conductivity of the
water.
Push the “On” button on the TDS meter (included) –
capture a small amount of your production water in
the cap of the TDS meter to get a reading of the water.
A TDS reading of 0 – 10 is acceptable for cleaning
windows, specific conditions and results may vary.
When measuring source water before pure water TDS
levels, it is important to rinse out any source water with
pure water to ensure accurate readings. Even a single
drop of source water will cause the pure water’s TDS
reading to be higher than it actually is. Read all sections
before continuing for optimal system performance.
Your TDS meter also has a thermometer which reads
temperature. This can allow you to monitor the
temperature of your feed water. RO membranes require
more pressure to create the same amount of clean water
as the temperature of the water gets colder. Running
your system at feed water temperatures of less than 10
degrees celsius (50 degrees fahrenheit) could result in
low flow exiting the system.
