SpectraPure
®
SpectraPure
®
Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
18
TROUBLESHOOTING GUIDE FOR RO/DI SYSTEMS:
1.
Low production rate:
a. plugged prefilters.
i. Replace prefilters.
b. low water temperature
ii. Warm feed water OR use higher GPD membrane.
c. low line pressure.
iii. Use booster pump OR use higher GPD membrane.
d. high TDS content.
iv. Use booster pump OR use higher GPD membrane.
e. fouled membrane.
v. Replace membrane to restore flux.
f. plugged flow restrictor.
vi. Replace flow restrictor & membrane.
2.
Zero production rate:
a. Missing flow restrictor.
i. Install flow restrictor in the yellow line.
b. Dried RO membrane.
ii. Try to restore flux by soaking in rubbing alcohol OR
replace the membrane.
c. Plugged flow restrictor.
iii. Replace flow restrictor and replace the membrane.
3.
Extremely high production rate:
a. Opened membrane due to chlorine
damage.
i. Replace membrane and carbon filter.
b. Very high line pressure (> 90 psi).
ii. Use a pressure reducing valve.
4.
High or “Unreasonable” Readings on TDS Meter:
a. Exhausted deionization cartridge.
i. Replace cartridge.
b. Bad membrane & exhausted cartridge. ii. Replace membrane and deionization cartridge.
c. Faulty monitor/probe.
iii. Replace monitor/probe.
d. Exhausted batteries.
iv. Replace with (2) 357A batteries.
5.
Pressure gauge does not register anything:
a. Missing flow restrictor.
i. Put flow restrictor in yellow line.
b. Pressure gauge screwed in too far.
ii. Unscrew pressure gauge one turn and retest.
c. Plugged pressure gauge orifice.
iii. Clean orifice with a needle.
d. Defective pressure gauge.
iv. Replace it.
6.
Low deionization cartridge life:
a. Defective membrane.
i. Replace it.
b. Low pressure (< 40 psi).
ii. Use booster pump.
c. High CO2 levels in water (> 5 ppm)
iii. Aerate RO product water or use a straight anion
cartridge ahead of DI cartridge.
d. High TDS in feed water (> 1000 ppm). iv. NO EASY SOLUTION.
e. High levels of silica, nitrates, phos-
phates, etc., in tap water.
v. Use a straight anion cartridge ahead of mixed-bed
cartridge.
f. High pH tap water (>9.0).
vi. Acidify feed water to the RO membrane to improve
its rejection.
