Pentek RO-2500, Installation And Operating Instructions Manual, Page: 14 / 84

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4 - REPLACING THE PRE-FILTER AND POST-FILTER
CARTRIDGES
1st Stage Pre-Filter and 2nd Stage Pre-Filter Cartridges:
The cartridge should be replaced every six months. If your water contains a high amount of sediment, it may
be necessary to change the 1st stage cartridge more frequently. If your water contains a high amount of
chlorine, it may be necessary to change the 2nd stage pre-filter more often.
1. Turn off incoming water supply and valve on the storage tank. Place a tray under the system to catch any
water that spills during removal of the filter housings.
2. Open faucet to release pressure.
3. Unscrew bottom of filter housings from caps. Use the filter wrench. Discard used cartridges.
4. Remove black rubber O-rings from grooves in housings. Wipe grooves and O-rings clean; set O-rings
aside.
5. Rinse out housings and fill each 1/3 with water. Add 2 tablespoons of bleach and scrub with non-abrasive
brush or sponge. Rinse thoroughly.
6. Lubricate each O-ring with a coating of clean silicone grease. With two fingers, press each
O-ring securely into groove below the threads of the appropriate housing.
1/4" Feed Tube
3/8" Drain Tube
1/4" Faucet
Drain Tube
GS-10RO
(4th Stage Post-Filter)
TFM-36 Membrane
(3rd Stage Pre-Filter)
1/4“ Storage
Tank Permeate
Tube
EPM10
(2nd Stage
Post-Filter)
P5
(1st Stage
Pre-Filter)
1/4“ Faucet
Permeate Tube