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PRECAUTIONS
GENERAL
Do not use with water that is microbiologically
WARNING:
unsafe or of unknown quality without adequate
disinfection before or after the system.
Filter must be protected against freezing, which can
CAUTION:
cause cracking of the filter and water leakage.
Because of the product's limited service life and to
CAUTION:
prevent costly repairs or possible water damage, we
strongly recommend that the bottom of all plastic
housings be replaced every five years for clear and
ten years for opaque. If the bottom of your housing
has been in use for longer than this period, it should
be replaced immediately. Date the bottom of any
new or replacement housing to indicate the next
recommended replacement date.
NOTE:
• Your water must be within required limits for satisfactory
operation. If not, your membrane life may be shortened and
your warranty will be voided (see Specifications on page 2).
• This reverse osmosis system will not protect against disease-
causing bacteria or remove naturally-occurring harmless
bacteria.
• Install on cold water line only.
• Do not use wicking or sealer to fit connections into the cap of
the filter. Plumber tape is recommended.
• Make certain that installation complies with all state and
local laws and regulations.
• The replacement cartridges and reverse osmosis membrane
included with this system have limited service lives. Changes
in taste, odor, and color of the water being filtered indicate
that the cartridge should be replaced (see Replacing the Pre-
and Post-Filters on page 9, and Replacing the Membrane, on
page 10).
• After prolonged periods of non-use (such as during a
vacation) it is recommended that the system be flushed for 5
minutes before it is used.
• A drinking water cartridge may contain carbon fines (very
fine black powder). After installation, flush the system for 5
minutes to remove the carbon fines before using the water.
• It is recommended that you run the tap at least 20 seconds
prior to using water for drinking or cooking purposes.
• The contaminants or other substances removed or reduced
by this water treatment device are not necessarily present in
your water.
RO MEMBRANE PRECAUTIONS
Chlorine will destroy the TLC-50 membrane. If you
CAUTION:
use the RO-2550 with a chlorinated or periodically-
chlorinated water supply, it is ABSOLUTELY
NECESSARY to use a carbon pre-filter (included
with the system). This carbon pre-filter should
be changed at least every 3 months to avoid
chlorine bypass. See Warranty for disclaimers and
limitations that apply to the TLC-50 membrane.
NOTE:
• To make sure no chlorine is present in the water that reaches
the membrane, you may want to use a chlorine test kit to
check the brine/reject water that flows from the membrane
to the drain. No chlorine should be detected.
• The TLC-50 membrane is resistant to naturally-occurring
bacteria.
4 • PENTAIR RO-2550 Installation and Operating Instructions
HOW REVERSE OSMOSIS WORKS
The RO-2550 Reverse Osmosis (RO) System uses a semi-
permeable membrane to reduce dissolved salts and minerals,
improving the taste and odor of your water. The RO membrane
is made of layers of micron-thin film wound around a hollow
center core. Water molecules can pass through the membrane,
but dissolved salts and minerals are rejected.
The RO-2550 Reverse Osmosis System features 4-stage filter
action. Your water supply is pre-filtered to reduce dirt and
chlorine that may foul the membrane. The RO membrane
separates this pre-filtered water into PRODUCT WATER and
DRAIN or REJECT WATER. Incoming water pressure forces
the product water through the membrane and into the storage
tank. Dissolved solids and other contaminants cannot pass
through the membrane and are sent to the drain as reject
water. When you open the drinking water faucet, product water
is drawn from the storage tank through an activated carbon
post-filter, providing you with cleaner, great-tasting water.
For each gallon of water produced, several gallons are
discharged as reject water. The storage tank can hold up to
2.8 gallons (10.6 L) of water at a time, for drinking and cooking
needs. When used under the Specifications on page 2 of the
manual, your Reverse Osmosis membranes should last 12-24
months.
BASIC INSTALLATION PROCEDURE GUIDELINES
• For standard, under-sink installation on 1/2" (13 mm) or
3/8" (10 mm) steel, brass, or copper cold water line.
• Please read all instructions and precautions before installing
and using your RO-2550.
• Numbered diagrams correspond with numbered steps.
INSTALLATION
• Read all installation and operating instructions before
installing and using your RO system.
• Numbered diagrams correspond with numbered steps.
1. Installing the Water Supply Adapter
The supply adapter fits 1/2"-14 NPS supply threads or
3/8" x 1/4" compression. If local codes permit, it may be used
to connect the system to the cold water supply line. If local
codes do not permit the use of the supply adapter, alternate
connectors can be obtained from your local supplier.
Directions:
(A) Turn off cold water supply line. If cold water line does not
have a shut-off valve under the sink, you should install one.
(B) Turn on the cold water faucet and allow all water to drain
from line.
(C) Disconnect riser cold water supply valve.
(D) Ensure the sealing gasket is fully seated into the feed
adapter valve female thread.
(E) Install feed adapter valve onto supply valve as desired. The
feed adapter valve may be installed at the bottom of the
supply hose or the top of the cold water line. Hand tighten
only.
(F) Connect the riser to the feed adapter valve.
NOTE: Be careful not to cross-thread.
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