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Section 4: System Maintenance
4.6 D.I. Resin Vessel Maintenance (vessel #3)
Replace the waterjet resin bag and pre-filter disc when the PPM reading on the TDS Meter
reading does not return to its proper range (between 40 – 100 PPM).
Resin Bag change out procedure:
1) Close the fluid inlet valve and open the bleeder valve on top of the lid to release the trapped air inside
the vessel.
2) Open the drain valve to drain out any water still in the vessel. While this is not necessary in order to
change the resin bag, it does make the resin bag easier to remove.
3) Remove the wing nuts from the lid and remove the lid.
4) Lift out the pre-filter disc and properly dispose of.
5) Remove the waterjet resin bag and properly dispose of.
6) Install a waterjet resin bag and a new pre-filter disc back into the top rim.
7) Visually inspect the O-ring gasket. Ensure all dirt particles are removed from the O-ring gasket, and
that it is not worn or damaged. Replace the O-ring gasket if it is worn or damaged.
8) Replace the lid and properly tighten all wing nuts.
9) Close the drain valve and bleeder valve prior to restoring flow to the vessel.
10) Open the fluid inlet valve. Place a rag over the bleeder valve and slightly open the valve to release
any trapped air inside of the vessel; close the bleeder valve once all the air is purged and fluid starts
to flow out of the valve. Fluid should now flow through the D.I. vessel whenever the solenoid opens.
4.7 Final Filter Vessel Maintenance (vessel #4)
Change the filter cartridges inside of the two filter vessels # 4 when there is a 30 PSI pressure
differential between the surrounding inlet and outlet pressure gauges.
Final Filter change out procedure:
1) Shut off the High-Pressure Feed Pump via the feed pump control switch on the electrical panel.
2) Open the unit by unscrewing the vessel housing from the mounting manifold.
3) Remove the fluid still inside of the vessel by discarding it into a drain or back into the CLS dirty tank.
NEVER discard the fluid into the clean tank.
4) Remove the spent filter cartridge and properly dispose of.
5) Ensure that all dirt is removed from the vessel threads and the threads on the vessel mount.
6) Visually inspect the O-ring seal for dirt or particles. If the seal is worn or damaged, replace with a new
lid seal. It is recommended that spare O-ring seal kits are kept in stock at all times.
7) Place the new filter cartridge inside of the vessel housing.
8) Screw the vessel housing back onto the manifold and properly tighten.
9) Return the vessel to service by turning the high-pressure feed pump back on.
10) Using a rag, relieve any trapped air from the vessel by pushing the bleeder valve down until fluid
starts to come out. Release the bleed valve once all the trapped air is purged.
11) Repeat steps for second filter cartridges.
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