
ELECTRONIC MONITOR OPERATIONS
The US-1500 system includes an electronic monitor that alerts
you when it is time to change your filter cartridges. Both filter
cartridges should be changed at the same time to ensure that
the monitor works properly. The monitor measures actual
water usage and is powered by a single 9-volt battery.
How the Electronic Monitor Works
The filter cartridges in the US-1500 should be replaced every
1,000 gallons. The electronic monitor uses a combination of
lights and alarms to alert you at different stages during the life
of the filter cartridges. The lights are visible on the front panel
of the filter system, to the left of the blue reset button:
0-950 gallons
No alarm. Green light flashes when water is turned on.
950-1000 gallons
Alarm BEEPS ONCE when water is turned on. Yellow light
flashes when water is on.
1000+ gallons
Alarm BEEPS TWICE when water is turned on. Red light
flashes when water is on.
Low or Dead Battery
No alarm. No lights. Replace battery.
NOTE: Gallons used while battery is dead will register on
meter when battery is replaced
NOTE: To extend battery life, any sequence that includes any
beeps will not be repeated if water is turned on again
in less than 15 minutes.
Reset Button
The blue reset button is located on the front panel of the
system. This button should only be pressed during initial
installation or when new filter cartridges are installed. After
pressing and releasing the button, you will hear two beeps
followed by a sequence of two green, two yellow, and two red
lights. This combination of beeps and lights indicates that the
system has properly reset the internal gallon counter.
REPLACING THE BATTERY
The battery should be replaced every time new filter cartridges
are installed or after 12 months of operation, whichever
comes first.
Replacing Battery and Filters at the Same Time:
Install new 9-volt battery as described in Step Eight: Installing
the Battery on p. 5. Make sure to press blue reset button on
front panel of system when finished.
Replacing Battery Only:
Remove the old battery and install the new battery. DO NOT
press the reset button on the front panel of the system
when finished.
FILTER CARTRIDGE REPLACEMENT
• Filter cartridges the US-1500 will last about 1,000 gallons
or twelve months before they need to be replaced. Filter
cartridge life varies depending on usage, and/or water
conditions. Changes in taste, color, and flow of the water
being filtered indicate that the cartridge should be replaced.
• Read all instructions before replacing filter cartridges.
1. Turn off cold water supply and open the drinking water
faucet to release pressure from system.
2. Unscrew and remove bottom of filter housing. Locate and
remove large o-ring, wipe clean of lubricant, and set aside.
Repeat for second housing.
3. Discard used filter cartridges. Using a non-abrasive sponge
or cloth, scrub the bottom of filter housings, o-ring grooves,
and caps with dish soap and warm water. Rinse thoroughly.
Fill bottom of each housing 1/3 full with water. Add 1
tablespoon of household bleach and scrub to disinfect.
4. Lubricate o-rings with silicone grease. Insert each o-ring
in groove and press into place.
NOTE: This step is important to ensure a proper housing
seal. Make certain each o-ring is seated level in its
groove or a leak may occur.
5. Screw bottom of housings with bleach water onto caps
without filter cartridges and hand-tighten. DO NOT
OVERTIGHTEN.
6. Turn on water supply. Let faucet run for about 10 seconds,
then turn off faucet and let stand for 20-30 minutes.
7. Turn on faucet and allow bleach water to run out
(about 3-5 minutes).
8. Turn off water supply to system and open faucet to release
pressure. Remove bottom of housings and empty of water.
9. Insert each filter cartridge in bottom of appropriate filter
housing: P-250 Cartridge Set: white with green end caps in
left housing, gray plastic cartridge in right housing.
NOTE: The filter cartridges should be installed with the
black gasketed ends pointing up.
10. Screw bottom of housings onto caps and hand-tighten. DO
NOT OVERTIGHTEN. Make certain cap standpipe slips
into cartridge.
11. Open water supply and turn on drinking water faucet to
release pressure in system. Let faucet run for 5 minutes
to remove trapped air and carbon fines. Check system for
leaks before leaving installation.
NOTE: It is recommended that you run the tap at least 20
seconds prior to using water for drinking or
cooking purposes.
NOTE: Initially, filtered water may appear cloudy. If you set a
glass of water on a level surface, you should be able to
watch the cloudiness disappear from the bottom of the
glass upwards. This harmless cloudiness results from
the release of trapped air within the cartridge and will
disappear within a few weeks after installation.
6• PENTAIR US-1500 Monitored Dual Filtration System Installation and Operating Instructions