WATER-10039 CWP Abbreviated Membrane Cleaning
Contents
1. GAMBRO Gambro Renal Products Technical Assistance Services http tech usa gambro com 800 525 2623 303 232 6800 Technical Update WATER PR 10039 10 5 2004 PROCEDURE Equipment Type WRO100 CWP Subject Abbreviated CWP Membrane Cleaning Procedure From Stephen Mullins Purpose The Cleaning Procedure for the WRO CWP as presented in the Operator s and Service Manual can be time consuming Many times an abbreviated procedure could produce similar results This tech tip will describe an abbreviated procedure that can be quickly performed at the end of the treatment day It is intended to be done as a maintenance cleaning or in cases where there is minimal loss of membrane performance In cases where there is severe loss of performance it may be more appropriate to use the full procedure as described in the CWP Operator and Service manual This procedure differs from the procedure outlined in the manual in the following ways e Valves 41 and 71 are not fully opened eliminating the requirement for recalibration prior to the use of the CWP e The dwell period for the cleaning chemical is the standard hour dwell that is part of the disinfection rinse cycle not a manual 2 3 hour dwell e The chemical pump fuse is removed instead of turning the pump rate to zero This eliminates the need to recalibrate the chemical disinfect uptake e This procedure takes less than 2 hour at the end of the treatment day as opposed to 4 5 hours when2. performed as described in the manual This simplifies regular cleaning of the membranes and makes it easier to coordinate the cleaning with clinic operations This Tech Tip will 1 Define the tools and materials needed to perform the cleaning procedure 2 Present the indications for cleaning the WRO CWP elements 3 Clarify the steps required for the cleaning procedure 4 Establish criteria for evaluating the effectiveness of the procedure Tools and Materials The membrane cleaning procedure will require the following tools and materials 1 2 3 4 5 6 Approved cleaning chemicals Mixing container larger than 1 gallon Stirring mixing rod Flexible gooseneck funnel Dry weight measuring device for measuring cleaning chemical Graduated cylinder for measuring liquid Indications for Cleaning Membranes 1 2 3 4 5 Permeate production has dropped by 10 or more from original values Permeate conductivity has increased steadily over time Reject rate has decreased by 10 or more from original values High pressure pump pressure has increased steadily over time Approved manufacturer or Gambro PM procedure criteria for membrane cleaning are met Procedure Record the critical operating parameters of the RO unit Items to be recorded are 1 2 3 4 Pure Water flow rate Permeate conductivity Percent Rejection P1 pump pressure optional The procedure for either high or low pH membrane cleaning is the same I
3. ng may be performed 4 Should there be no improvement in performance there may be other factors affecting the CWP calibrations failures etc Call Technical Support at 1 800 525 2623 for further assistance
4. pump to disable it Mark the pump rate dial s position with marker or tape for future resetting Begin a Disinfection cycle per procedure After the Valve Test Before cycle is completed This takes 6 minutes The Screen will have counted down from 132 minutes to 126 minutes SLOWLY pour the cleaning solution into the Inlet Water Tank using the gooseneck funnel 2 9 Allow the Disinfection Cycle to complete by itself It is not mandatory to remain to observe the cycle completion The Disinfection Cycle will complete as it normally does and rinse itself out 10 Clinical staff should perform residual chemical tests per manufacturer recommendations and restart the CWP in the morning 11 Replace the fuse in the proportioning pump and reset the speed dial to the marked position if necessary Evaluation of Cleaning Procedure 1 Record the same RO operating parameters as done before the cleaning procedure was begun 2 These measurements should approach or equal the same values as documented when the RO unit was installed 3 Should the new values show improvement it may be necessary to run the cleaning procedures again until the cleanings do not improve performance This would then indicate that the maximum benefit from cleaning has been achieved It may also be necessary to try an alternate cleaner For example if an acid cleaning was performed and there was no performance improvement then an alkaline cleani
5. t is only the chemical used that differs in the procedures The steps include 1 2 3 4 5 6 7 8 Advise clinical staff that the cleaning procedure will be performed that night They will be required to replace the DOS connector in the Operate position and enter the Operator Code 813 before pressing the Start button in the morning This is what is normally required after any Disinfection cycle and the clinical staff should be familiar with the procedure The CWP will not AUTOSTART in the morning following this cleaning procedure and the clinical staff should be prepared to perform the steps needed after any disinfection cycle This may entail the staff coming in a little earlier to manually start the CWP in the morning Place a sign on the CWP operator panel stating the type of cleaning chemical that has been added to the CWP and the type of residual test that must be performed as per the cleaning chemical manufacturer s recommendations Ensure that there are test strips or other residual test devices available for the staff in the morning Fill a large mixing container with approximately 4 liters of warm pretreatment or permeate water Follow the cleaning chemical s manufacturer guidelines or Gambro s Operator and Service Manual mixing guidelines for that specific chemical Thoroughly mix the chemical until it is completely dissolved Remove the fuse from the lower left hand side of the proportioning
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