Instructions / Assembly

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8). How to Test Your Water Pressure:
Get a water pressure gauge that adapts onto your sink or garden faucet (from hardware store), attach
gauge onto faucet, turn water on to FULL, then take a reading.
For some areas, water pressure is lower during the day and higher at night when less people are using
water. So to get an accurate average, take several measurements at different times of the day and aver-
age them out.
9). TDS Meter – How to Test Your Water’s Quality:
The TDS meter is used to test your water’s quality before and after the RO system. It also tells you when
the membrane needs to be changed.
Use 2 clean glasses, put your tap water in one glass, and the filtered water in another (rinse this glass
with filtered water several times to get an accurate reading).
Turn on the meter. The meter will show “000” reading on its screen. Place the TDS meter into the Prod-
uct water. Record product water’s TDS reading. Then do the same for the Tap water. Record the Tap
water’s reading. Compare the 2 readings.
The Product water’s TDS should be about 3%-10% of your Tap water’s TDS. This is a normal range.
For example:
Input tap water TDS is 100 ppm > Then output filtered water TDS should be 3-10 ppm.
This means the RO system has removed 90% - 97% of the contaminants (TDS) from your input water,
leaving only 3%-10% of TDS in the filtered RO water. This is a normal rejection range. This means the
RO membrane is in good condition.
When the product water’s TDS reaches 15%-20%, then it’s time to change the membrane.
10). How do I know when to change the membrane?
It’s best to check the membrane’s condition with a TDS (Total Dissolved Solids) meter. When the TDS
reading of the filtered water starts to increase, or when the taste of the pure water is not as good as
before, it’s time to replace the membrane and the 5th Stage carbon filter. Please see “Page 24” for
details on how to test your water’s quality and membranes using a TDS meter.