SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
®
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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%
37.7 GPD would be the Actual Production Rate
Performance Test
The performance of a RO membrane is measured by its ability to reject salts
(or TDS (Total Dissolved Solids)).
Important: Test the quality of the membrane once every 6 months.
Note: This procedure will require a Conductivity Meter (TS-C61) or TDS Meter (TS-T71).
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 directly from the blue product
water line. (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 % : Rejection rates less than 95% may
indicate that the membrane should be replaced.
SpectraPure®Inc
.
Fax 480.894.6109 Fax us toll-free 1.877.527.7873
E-mail: spectra@spectrapure.com Visit us on the web www.spectrapure.com
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SpectraPure
®
TERMS AND CONDITIONS OF SALE
1. Shipping charges on units or parts submitted to our facility for repair or
replacement must be borne by the registered purchaser. After repair or
replacement, the factory will return the unit or part freight prepaid to the
customer.
2. We assume no warranty liability in connection with our equipment other than as
herein specified.
3. This warranty is in lieu of all other warranties expressed or implied, including
warranties of fitness for a particular purpose.
4. We do not authorize any person or representative to assume for us any other
oblligation on the sale of our equipment. This is the exclusive remedy and liability
for consequential damages under any and all warranties which are excluded to
the extent exclusion is permitted by law.
5. Proof of original purchase date must accompany all warranty claims.
6. SpectraPure, Inc. reserves the right to change prices without notice when
necessary. All prices in the catalog are quoted in US dollars.
7. Claims for error in quantity or condition must be made within 10 days of receipt
of material. SpectraPure, Inc. will not be responsible for any claimed shortages
not reported within 10 days. Returns other than warranty claims may be subject
to 20% restocking fee.
8. SpectraPure, Inc. cannot be held liable for damage or loss to a shipment by a
freight carrier. Check shipment for damage before acceptance or note on freight
bill subject to inspection for concealed damage. Consignee must file claim.
SpectraPure, Inc. will offer as much assistance as possible.
9. A complete credit check is required prior to shipping on a Net 30 or “C.O.D. -
CUSTOMER CHECK ACCEPTABLE” basis. In the interim period during which credit
references are being evaluated, all orders must be shipped “C.O.D. - CERTIFIED
FUNDS” (cash, cashiers check or money order).
10. All returned checks (due to insufficients funds or closed accounts) will be
subjected to a
$25 service charge.
Invoices on Net 30 accounts not paid within 30 days of shipment will be considered delinquent and
will accure Finance charges at the rate of 1.5% per month (18% per annum).
