quality of resin we use, the water you get will be, literally as pure as possible. The
resin is a color indicating resin; it will slowly change from a dark purple/blue/black
to a rust red/orange color. As this filter nears the end of its useful life you may
experience “break though”. Keep this in mind, depending on the water quality
needed. For applications demanding 18 Mega-Ohm water, 2 DI’s are STRONGLY
recommended.
Trouble shooting guide
Problem
Solution
High TDS after
membrane
Clogged Pre-filters. Causing Pressure Drop. Insufficient pressure will yield
poor TDS rejection from RO membranes. Change Pre-Filters.
Average Membrane life is 2 to 3 years. Most common cause for
membrane failure is insufficient pre-filter maintenance. AquaFX Carbons
are rated for 3,750 gal @ 1.0 GPM of 2ppm Chlorine. Do not exclude
drain water from this capacity, as it is treated water. Very high TDS
(>550ppm) may also yield premature failure.
Low incoming water
pressure.
Incoming water pressure must be above 40 PSI, Add a booster pump if
below 40psig. Make sure Pre-Filters are not clogged causing low
pressure.
No water to drain.
Flow Restrictor is clogged, Replace Drain Flow Restrictor. (rare)
Check to see if water is turned on.
All water is going
out of the drain
With no back pressure, most of the water will exit out of the drain. Make
sure a Flow restrictor is present.
Very little/slow
water production
Reference units flow rate vs. actual production. Slow flow from RO is
normal. Cold water, low pressure and high contaminant levels will
contribute to decreasing the rate of water production. Heating water (NO
WARMER THEN 80 Degrees F), increasing pressure or additional pre-
filtration will help to counteract these adverse affects.
Drain Water
Continues After
Product line is full
The most common cause of a ‘continuing drain’ is a pressure leak on the
product side of the RO. If the pressure cannot build, the automatic shut-off
(ASO) will not close. Check ASO with a ball valve right after RO. Close
Ball valve then wait 1-3 minutes. If drain continues, replace ASO Valve. If
it stops, have the customer, find then stop pressure leak. If a float valve is
being used, it is more than likely the culprit.
The incoming feed
water TDS has
increased.
An increase in feed water TDS will also give an increase in Product Water
TDS. R.O. (Dolphin) Users will see this rise in TDS, due to the membrane
removes a percentage of TDS.
DI is
exhausting
very fast
R.O. Membranes are manufactured with a preservative on them, if your initial
startup allows the membrane to ‘rinse’ into the DI; there will be some immediate
exhaustion, followed by normal exhaustion.
Chloramines Vs Chlorine
– If the customer’s water is disinfected with
Chloramines (NH
2
CL) the ammonia portion will still be present post RO.
