17
CARE OF YOUR REVERSE OSMOSIS SYSTEM
PREFILTER AND POST FILTER CARTRIDGES
You must replace the prefilter cartridge often to protect
the RO membrane from being destroyed by chlorine,
and/or from plugging with sediments in your water sup-
ply. If the water supply contains both chlorine and sedi-
ments, replace the prefilter cartridge at least every 6
months of product water use. Replace more often than 6
months if it begins to plug with sediments.
If the water has sediments only, with no chlorine, you
may notice a slower making of product water as the pre-
filter collects the sediments. When this occurs, replace
the prefilter cartridge. Also replace the post filter car-
tridge.
To replace the filter cartridges, see Figure 16:
1.
Remove (turn to the left) the prefilter cartridge from
the filter head.
2.
Remove the postfilter cartridge (turn to the left) the
postfilter cartridge from the filter head.
3.
Discard both cartridges in a proper manner.
4.
Insert new cartridges, starting with the post filter,
turning to the right to reattach the cartridges.
5.
Model ERO-385E only: replace the battery with new
(CR 2032 or equivalent).
6.
On the ERO-385E or HERO-385Plus, press and
hold the button on the RO electronics enclosure until the
green light begins flashing. Release the button during the
3 seconds that the light flashes.
7.
It is recommended to discard the first full tank after
the filters have been changed to minimize carbon fines.
RO MEMBRANE CARTRIDGE
This reverse osmosis system contains a replaceable com-
ponent critical to the efficiency of the system.
Replacement of the reverse osmosis component should
be one with identical specifications, as defined by the
manufacturer, to assure the same efficiency and contami-
nant reduction performance.
The life of the RO membrane cartridge depends mostly
on the pH and hardness of the supply water to the RO
system (see specifications). Cartridge life is shorter with
higher pH. For example, if supply water pH is from 6.8
to 7.7, the cartridge may last for well over one year.
However, cartridge life may be as short as 6 months if
the pH is as high as 8.5 to 10. Higher pH weakens the
cartridge membrane and causes pin-hole leaks.
It's time to replace the RO cartridge when the red LED
To keep your reverse osmosis system operating and pro-
ducing high quality water, you must make sure supply
water is always within the limits shown in the specifica-
tions. Good supply water helps to assure longer life from
the RO membrane cartridge, prefilter and postfilter car-
tridges. However, each of these will wear out in time and
need replacement.
This reverse osmosis system contains a replaceable
treatment component critical for effective reduction
of total dissolved solids. The monitor faucet feature
provides continuous analysis of the systems per-
formance. For systems not equipped with the moni-
tor faucet function, it is highly recommended that
you have your water tested at least every 6 months
to verify your system is performing properly. Test
kits are available by calling 1-800-949-8220, or
check the water testing section of your local phone
directory.
If the RO assembly is wall mounted, you may be able to
replace parts with the assembly left on the wall. If not,
simply lift the RO assembly from the mounting washers
and lay on the cabinet floor when replacing the prefilter
and post filter cartridges and RO membrane.
FIGURE 16
prefilter
cartridge
RO cartridge
postfilter
cartridge
Turn cartridges in the direction of
the arrow to remove. Turn them
in the opposite direction to install.
remove
remove
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