WFRO60X-1
V4.5E
15
Reverse Osmosis System Maintenance
PREFILTER/POSTFILTER MAINTENANCE
The pre-filter and post-filters are replaceable activated carbon cartridge, DuPont model number WFQTC30001. They are located in the 1st and 3rd positions of the 3-stage system. It is recommended to
replace the pre-filter and post-filter cartridges at least every 6 months of product water use. The pre-filter and post-filter ARE BOTH DuPont WFQTC30001 cartridges. You may need to replace these filters
more often with a great deal of use or a high level of incoming sediment. This will protect the RO membrane from being destroyed by chlorine and plugging with sediments. You may notice a slower output
of product water as the pre-filter and post-filters build up with sediments. Replace the pre-filter and post-filter cartridges when this occurs. See below for instructions.
RO MEMBRANE CARTRIDGE MAINTENANCE
The Reverse Osmosis cartridge is a tightly wound membrane located in the center position of the 3-stage system. The membrane reduces the dissolved solids and organic matter. The life of the Reverse
Osmosis membrane cartridge depends on the pH and hardness of the supply water (see specifications). Membrane life is shorter with higher pH. For example, if supply water pH is under 7.5, the cartridge
may last up to 12 months. However, cartridge life may be as short as 6 months if the pH is as higher than 8.0. Higher pH weakens the cartridge membrane and causes pin-hole leaks. It’s time to replace
the Reverse Osmosis cartridge when the production rate and the quality of the output water drops. The output water may begin to taste different, indicating solids and organics are passing through the
Reverse Osmosis membrane. See Reverse Osmosis cartridge replacement.
The Reverse Osmosis cartridge output and flow rate is greatly determined by three factors: 1. Temperature of incoming water. The lower the temperature is directly proportional to the slower flow rate.
All Reverse Osmosis membranes are tested at 77° Fahrenheit. However, incoming water should not exceed 100° Fahrenheit. You need to ensure that the Reverse Osmosis system is placed in a climate
controlled area and does not have the potential to freeze. 2. TDS (total dissolved solids) present in the incoming water. More TDS requires more time for the membrane to filter and remove. Ensure
incoming TDS does not exceed 2000 ppm. 3. Incoming water pressure is one of the key factors determining the flow rate of the RO membrane. Higher pressure will enable a higher flow rate. Pressure must
be above 40 PSI for proper operation. You may need to install a Booster Pump or Permeate Pump if your pressure is below 40 PSI.
RO MEMBRANE CARTRIDGE REPLACEMENT
Complete the following steps to replace the filters.
1. Remove (turn to the left) the pre-filter cartridge first from the system to relieve pressure on the Reverse Osmosis filter.
2. Turn the Reverse Osmosis filter to the left and remove the Reverse Osmosis filter.
3. Remove the post-filter cartridge.
4. Discard all of the QuickTwist® filters in a proper manner.
5. Install new filters in reverse order: 1) post-filter, 2) Reverse Osmosis, 3) pre-filter. Turn cartridges to the right to secure them to the system.
6. Check tank pressure, and purge the Reverse Osmosis System per the instructions in Step 8.
PRE-FILTER & POST-FILTER CARTRIDGE REPLACEMENT
Complete the following steps to replace the filters.
1. Remove the QuickTwist® pre-filter cartridge, by turning to the left, from the system.
2. Remove the QuickTwist® post-filter cartridge, by turning to the left, from the system.
3. Discard the QuickTwist® filters in a proper manner.
4. Install new QuickTwist® filters in reverse order: 1) post-filter, 2) pre-filter by turning filters to the right to secure them to the system.
5. Purge the Reverse Osmosis System per the instruction in Step 8.
DRAIN FLOW RESTRICTOR
The drain flow restrictor is vital for proper operation of the Reverse Osmosis membrane cartridge. The restrictor keeps water flowing through the membrane at the proper rate. This is to ensure the system
produces the best quality product water. Periodically check the restrictor assembly to be sure it is clean and unrestricted. if the drain flow assembly requires service, review Step 6 (4A). Disassemble and
assemble as shown.
