Labconco WaterPr RO Systems 90750 Series - Manuel (Page 30)

Chapter 5: Maintaining Your WaterPro RO System
26
Original Instructions
12. Turn off feed water supply and press the manual dispense button to relieve the pressure.
13. Remove the tank and sanitize with formaldehyde solution.
14. Allow the unit to stand for 1 hour.
15. If the system will not be in use for an extended time, leave the formaldehyde solution in the
system.
16. If the system is to be returned to service, flush the residual solution from the vessel for 1
hour by attaching a hose to the dispensing valve and setting time dispense to 60 minutes.
Both inorganic and organic fouling is indicated when either or both of the following occur:
• The normalized (temperature corrected) product flow rate drops by 20%.
• The conductivity of the permeate rises noticeably.
Inorganic Fouling
Inorganic fouling of the membrane is caused by mineral scale such as:
• Calcium carbonate
• Calcium sulfate
• Barium sulfate
• Strontium sulfate
• Iron or manganese
Inorganic fouling can be cleaned with the following recommended solutions:
0.5% HC1 with a final pH of 2
Procedure
1. Collect approximately 4 liters of reverse osmosis water in a container and set aside for use
in preparing the cleaning solution.
CAUTION: Use only chlorine-free water. Use of chlorinated tap water will
degrade and destroy the RO membrane.
ATTENTION : Utilisez uniquement de l’eau sans chlore. L’utilisation d’eau
chlorée va dégrader la membrane d’osmose inverse.
2. Shut off feed water valve.
3. Relieve the water pressure in the unit by opening the dispense valve and directing the water
to a drain.
4. Disconnect the RO unit from the electrical power source by unplugging the unit.
5. Remove the carbon/prefilter cartridge and discard the water.
!