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Trouble Shooting Guide - Reverse Osmosis Systems
Problem - Water Quality
High Total Dissolved
Solids (TDS) in the
Product Water
Low Quality Water
Taste, Odor
and/or
Tank fills too fast
Low Quality Water
Taste, Odor
and/or
Tank fills too fast
www.ewswater.com
Possible Causes
TDS "Creep" Tank has never been
completely emptied
Clogged prefilter(s)
Low water pressure
RO membrane is new
RO membrane issues
RO membrane is expended
Product water and drain water
tubing or connections are crossed
No drain flow
The RSR valve is not closing
New in-line activated carbon post
filter or activated carbon cartridge
not rinsed completely
The feed water TDS has increased
Chlorine in feed water to membrane
Restricted brine flow
Low feedwater pressure over membrane Feedwater below 60 psi will produce lower quantity
High TDS - total dissolved solids
reducing feedwater pressure over
membrane
High feedwater pressure
O: 702.256.8182; M-F 8:30am-4:30pm PST
Solution
At night before bedtime, open dispenser, close other
devices, then empty all the water from the tank. Allow
water to produce overnight. Open other devices after
tank is completely filled. Do this quarterly or as
needed.
Replace filter(s)
Feed water pressure must be above 40 psi
Check incoming supply water at inlet
New membrane has a preservative. Follow correct
start-up procedure and empty tank 2 times before
usage
Remove and check membrane. Inspect 2 O-rings
Membrane o-rings, brine seal at insertion end,
check brine seal for proper seating into membrane
housing
If membrane life is unusually short, find and correct
the problem. Replace membrane.
Correct tubing and plumbing connections
Clear or replace drain restrictor. Drain line is
clogged or restricted
Clear or replace air gap line or faucet
"TDS Creep" (see above) empty tank completely
and produce a new tank of water. Do this at least
4 or more times a year. Make sure pressure in
tank is between 5- 7 lbs.
Repair or replace RSR valve components
Flush with several full tanks of product water
An increase in feed water TDS will give a
corresponding increase in product water TDS
CTA membrane on 3 Stage unit is tolerant to
chlorine levels up to 2 ppm
TFC membrane on 4 & 5 Stage units are not
chlorine tolerant
Change or add precarbon filter to remove chlorine
Blocked brine line will foul membrane, decreasing
production and rejection rate. Check the drain line
for obstructions or restrictions blocking the flow
into the drain pipe and air gap (if applicable).
and quality than the membrane specifications.
Feedwater less than 35 psi should consider using
a low pressure boost pump. Booster pump require-
ment, inquire with web site or our offices
Feedwater above 65 psi should be regulated to
a maximum of 65 psi into the system
E: customerservice@ewswater.com
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