How to Change In-housing Cartridges in 1st – 3rd Pre-filter Stages
1. Shut off the water supply valve and tank valve, open the faucet to depressurize. Place a
bucket or towel under the unit to catch water spills.
2. If there is enough room under the sink and the filter system is hung on the wall, it could be
easier to twist the filter housing off without taking the unit off. Otherwise, it could be easier
to pull the system out, lay it down and work towards the housing bottom. Please be careful
with tubing connections when pulling the system out.
3. Twist off the filter housing in a counter-clockwise direction when looking from the bottom.
Use a housing wrench (the bigger one) if necessary.
4. Refer to Installation Step 4.1 to install a new vertical filter cartridge and twist the housings
back on. Remember not to overtighten, or it will be hard to open next time.
Stage 4 RO Membrane: Replace every 2 – 3 years or sooner if TDS level starts
increasing.
Check the TDS level at least once a month to monitor the system performance. The rejection rate
should be above 90% (NSF/ANSI STANDARD 58 for RO water filter).
How to Change Reverse Osmosis Membrane
1. A reverse osmosis membrane usually lasts about 2 – 3 years, depending on the source water
quality, clean water usage, and the replacement frequency of the three pre-filters.
2. To ensure system performance and water purity, filter cartridges must be replaced on
schedule. Use the TDS meter periodically to check the rejection rate.
3. Shut off the water supply valve and (optional) tank valve, open the faucet to depressurize
4. Place a bucket or towel under the unit to catch water spills.
5. Remove the tubing from the inlet fitting on the membrane housing cap. Use a housing
wrench or by hand to twist off the housing cap in a counter-clockwise direction when
looking from the inlet. Pull out the old membrane. Use scissors or pliers to apply leverage if
necessary.
6. Clean the housing using hot water and optional scent-free dish soap. Rinse thoroughly. Cut
open the small end of the sealed bag of a new RO membrane, hold the new membrane with
the bag, and insert it into housing without touching the membrane with your bare hands,
which may contaminate it.
7. Check the O-ring on the open end of the membrane housing. It is recommended to replace it
every 3 years to prevent leaks. Twist the membrane housing cap back on by hand. Use a
wrench for a final 1/4 turn if necessary. DO NOT overtighten.
Page 13 www.123filter.com | (678) 261-7611 | support@123filter.com
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