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Trouble Shooting Guide - Reverse Osmosis Systems
Problem - Water Quality
Water Cloudy
Salty Taste or Whitish
Ice Cubes
TDS Test less than
75% Rejection
Low Quality Water
Taste, Odor
(also see next page)
Unpleasant taste and/
or odor
Metallic flavor
Discoloration
Rotten egg smell from
water
www.ewswater.com
Possible Causes
Air in system
System start-up
Filter or membrane replacement
New installation, changing filters,
disinfecting the system
Open/close and open of water supply to
home or in home
Membrane seals
Hot or High feed water temperature
High feedwater TDS
RO Membrane replace
High feedwater temperature
Post filter elements
Pre- and Postfilters
Pre-Treatment needed
Filter/Membrane/UV housing issues
Storage tank water issue
Need to replace filters
System needs disinfecting
System was idle, stored or misused
for a long period of time.
System under unfavorable conditions or
changing water conditions
Hydrogen sulfide, iron, manganese is in
the household water supply, presence of
iron/sulfur bacteria
System misapplied
O: 702.256.8182; M-F 8:30am-4:30pm PST
Solution
Air in the system is a normal occurrence with initial
start-up of the RO system. This milky or cloudy
look will disappear during normal use within 1-2
weeks. Condition can reoccur after any filter
change-out
Empty and fill tank 3 times to reduce air and fines
from system and/or filter replacement start-up
Membrane seals are breached, re-seat or replace
membrane
Water supplied to unit must be below 95°F
Feedwater TDS levels above 500 ppm can result in
lower quantity and quality product water. 1 psi loss
per every 100 ppm above 500 ppm.
Treat the same as low feedwater pressure. In-
crease water line pressure or may need booster
pump for system
Membrane replacement should occur when rejec-
tion rate has dropped below 70%
Feedwater temperatures above 95°F can produce
problems, cool water or find another supply
New post filter elements can release small air
bubbles and small fines which show as additional
TDS in the product water. Follow proper start-up
instructions
Pre- and Post filters require replacement
Feedwater pretreatment may be necessary for
water supplies with high levels of iron, hydrogen
sulfide, water hardness, etc. which may be exceed-
ing system tolerance parameters
Disinfect and inspect housings
Empty tank, sanitize, empty, flush and refill
Replace filters and follow start up procedures
Follow disinfection procedure
Flush system by running water, replace filters and/
or disinfect
Determine what changed in your water supply and
Flush, Replace and/or Disinfect, or change type of
water treatment system based on local water
conditions. Call your municipality or have your well
tested.
Hydrogen sulfide, iron and manganese must be
removed from household water supply before filter
system.
Visit our web site for other systems.
E: customerservice@ewswater.com
28
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