AquaFX The AquaFX Mako RO/DI - Manual (Page 8)

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.
RO/DI (Mako, Mako, Great White) Users will not see this rise, but the DI
will exhaust faster than normal.
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.
For R.O. (Dolphin) users, they may wish to purchase DI to remove the
ammonia..
RO/DI (Mako, Mako, and Great White) users will have the ammonia
removed by the DI. This will tax the DI, Chloramines appears in several
forms, so the decreased life would depend on the state of Chloramines.
(mono, di or tri)