SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
215 South Industrial Drive, Suite 2A Tempe, Arizona 85281-2941
®
20
Membrane Output Calculation Example
What is the expected GPD from a 75 GPD System at 40 psi pressure and 60°F
water temperature?
PCF = 40 ÷ 60 = 0.666
TCF = 0.754 (from Table 1)
Expected GPD = 75 × 0.666 × 0.754 = 37.7 GPD ± 15%
Performance Test
The performance of a RO membrane is measured in terms of its rejection charac-
teristics.
Important: Test the quality of the membrane once every 6 months.
Note: This procedure will require a Conductivity Meter (TS-C61).
Procedure:
1. Measure tap water conductivity. (Call it X)
2. Run the system for 15-20 minutes.
3. Rinse test instrument cell 2-3 times with RO water.
4. Measure RO water conductivity. (Call it Y).
5. Subtract RO water conductivity from tap water conductivity. (X - Y)
6. Divide this quantity by tap water conductivity. (X - Y) ÷ X
7. Rejection = [(X - Y) ÷ X ] ×100
* Conductivity in the above procedure could be replaced by hardness, alkalinity,
nitrate, phosphate, silica etc. (measured in ppm or mg/l).
Rejection of the RO Membrane Calculation Example
1. Tap water hardness = 150 ppm (X)
2. RO water hardness = 7 ppm (Y)
3. X - Y = 143 ppm
4. (X - Y) ÷ X = 143 ÷ 150 = 0.953
5. Rejection = [ ( X - Y) ÷ X ] ×100 = 0.953 ×100 = 95.3
Membrane Hardness Rejection = 95.3 % : Membrane OK
Production Rate
SpectraPure
®
SpectraPure®Inc
.
Fax 480.894.6109 Fax us toll-free 1.877.527.7873
E-mail: [email protected] Visit us on the web www.spectrapure.com
5
SpectraPure®Inc
. assumes no responsibility for water
damage due to leaks. It is the user’s responsibility to determine
that the system is leak-free.
System Start-Up
System Hook-Up
1. Attach the garden hose adapter
(black tubing)
to your cold water
source. Never run hot water (greater than 100° F (38° C)) through the
system.
2. Place
the
yellow concentrate (waste) tubing
and the
blue purified
(product) water tubing
into a drain. Do not restrict flow from these lines.
3. Open the cold water supply valve. You may use pressure up
to 80 psi (5.5 bar).
Check the system to ensure that all fittings are tight and leak-
free before leaving the system unattended.
Note: It is recommended that at least 2 gallons (7.57 liters) of puri-
fied water be discarded before collecting purified water for use. If
the unit is not used for several days, run the system for at least 15
minutes before collecting any water.
System Initialization
If you are setting up your system for the first time or replacing a
membrane, please see the “Checking the Concentrate to Purified
Water Ratio” section on page 6 .
