Installation Guide

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system out, lay it down, and remove the housings at that point. Be careful with the tubing
connections when removing the system.
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 the new vertical filter cartridges and twist the housings
back on. Remember not to over tighten or it will be hard to unscrew 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. Reverse osmosis membrane usually lasts about 2 – 3 years, depending on the source water
quality and the replacement schedule 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 water purity.
3. Shut off the water supply valve and tank valve, turn on 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 looking from inlet.
6. Pull out the old membrane. Use scissors or pliers to apply leverage if necessary.
7. 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 the housing without touching the membrane with your bare hand, to avoid
contamination of the membrane.
8. Check the O-ring on the open end of the membrane housing. It is recommended to replace it
every 3 years to prevent leaks.
9.
Twist the membrane housing cap back on by hand. Use a wrench for another ¼ of a turn if
necessary. DO NOT over tighten.
Stage 5 FT15 fine carbon: Replace every 12 months
Disconnect tubing on both ends, put them on the new cartridge.
O-rings: Replace every 3 years or sooner if leak happens at O-ring.
The package comes with spare O-rings for the pre-filter housing, and 1 spare O-ring for the membrane
housing. Please save them along with this manual.