Instructions / Assembly

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SYSTEM MAINTENANCE
For replacement filter cartridges, visit 123Filter.com or Google “Model replacement filter” online, in
which “Model” is the model number of the system, e.g. RCS5T.
Stages 1 – 3 pre-filters: Replace every 6 – 12 months, depending on
source water quality and clean water usage.
The frequency depends on the source water quality and clean water usage. They could last longer in city water, and
shorter in well water. Different areas have good or bad water. Some customers reported they had to replace the 1st
stage every 1-3 months when they saw through the clear housing where heavy sediments and particles turned the
white cartridge into dark brown. Some customers reported they could replace them every 12 months. To protect the
RO membrane in the 4th stage, it is required to replace the pre-filters at least every 12 months.
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 filter system is hung on wall, it could be easier to
twist the filter housing off without taking the unit off the wall. 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 1.1 to install a new vertical filter cartridges and twist the housings
back on. Remember not to over tighten or it will be hard to open next time.