Changing the RO Membrane (cont).
STEP 4:
Push the new membrane back into the housing with the end that has the two black o-rings
going in first. Push firmly until it bottoms out and can’t go in further. Then thread the cap back
on tightly and reconnect the white 1/4" tubing. . Be sure the o-ring in the cap is in place.
Important Information & Performance Parameters
Reverse Osmosis is the most efficient and cost-effective way to remove the majority of all
contaminants from your water. The key component of the system is the RO membrane composed of
tightly wrapped sheets of a semi-permeable material. Under pressure, the membrane allows pure
water to pass through it and rejects, or flushes away, most impurities down the drain. That is why
all RO systems have a certain amount of waste water. The ratio of waste water is determined by the
flow restrictor installed in the flow
restrictor/flush kit assembly. The system comes with a choice
o f 2:1 and 1:1 flow restrictors. Refer to page 6.
The flow of purified water is determined by the GPD rating of the membrane, inlet pressure and inlet
temperature. The stealthRO300™ has the capacity to produce 300 gallons per day (approx. 12.50
gallons/hour) when your inlet water is at 77 ºF, 60 PSI, 500 PPM. If your inlet pressure is less than 60
psi, you may experience less than the rated 300 GPD flow rate. A minimum of 40 psi is required to
operate the system. The higher the inlet pressure, the better the flow. A booster pump is available as an
option in case of low pressure and is necessary if your pressure is below 40 PSI (HL# 29020).
You will notice in colder areas or in the winter, when water temperatures are lower, that the flow rate
will be slower.
Inlet water that is very high in total PPM or very hard with calcium or magnesium, or high in certain
contaminants such as iron or silica may shorten the life of the membrane and/or cause slower flow
rates. The RO membranes can handle inlet water up to 1,000 PPM and with a hardness up 10
grains per gallon (170 PPM). Note that this is considered both very contaminated and very hard water
and may shorten the life of your membrane. At these levels of contamination and hardness, and
especially beyond, you may consider pre-treatment in the form of a water softener or other
equipment. Softened water can be run through your stealthRO300™ system for optimal
performance. The membrane in the stealthRO300™ is capable of removing 99% of salts that
are introduced by the softener. Contact HydroLogic for more info at 888-426-5644.
All RO systems exhibit “TDS creep”. The first few ounces of RO water produced are higher in PPM than
after the system has run a few minutes. Take any PPM readings a full five minutes after turning the
system on to ensure accuracy. Call us with questions about how to customize your water filtration needs
and pre-treatment equipment.
13
STEP 5:
Run the system for 30-45
minutes , discarding all
purified and waste water
before using.