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Operation and Maintenance Manual for

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OPERATING INSTRUCTIONS LC <strong>Manual</strong> 11/02 Rev. 3<br />

3.5 SHUTDOWN (LESS THAN 4 DAYS)<br />

CAUTION<br />

If the shutdown is due to a malfunction, be sure to disconnect the<br />

electrical power <strong>and</strong> turn off the water supply be<strong>for</strong>e making repairs or<br />

replacements.<br />

If the system is not to be operated <strong>for</strong> up to 4 days, the system should be placed in the<br />

STANDBY mode. When in this mode the RO system cycles on <strong>and</strong> off continuously <strong>for</strong><br />

a user settable duration at a user settable interval until the mode of operation is changed<br />

again. This mode will allow the system to return to normal (TANK or DIRECT FEED<br />

mode) operation at any time with no adverse affects on the water quality or RO<br />

membranes.<br />

3.6 LONG TERM SHUTDOWN PROCEDURE<br />

CAUTION<br />

CAUTION<br />

If the system is to be down <strong>for</strong> a period longer than 4 days, it is recommended that a<br />

biocide be pumped into the membrane elements to prevent biological growth.<br />

Failure to store the membranes in a biocide <strong>for</strong> long term shutdown<br />

can cause irreversible damage to the membranes due to bacterial<br />

growth.<br />

The solution USFilter recommends is a 0.5 to 1.0% solution of sodium bisulfite. For<br />

conditions where freezing may be a problem, the solution should also contain up to 18%<br />

(by weight) glycerin or propylene glycol. Refer to RO membrane data sheet in Appendix<br />

<strong>for</strong> further in<strong>for</strong>mation.<br />

The following equipment <strong>and</strong> materials are needed:<br />

CIP Cleaning Skid<br />

RO Product Water or DI Water<br />

Sodium Bisulfite (food grade)<br />

Propylene Glycol or Glycerin (if required)<br />

Safety Equipment<br />

A. Fill the tank on the cleaning skid with the appropriate quantity of RO product<br />

water or DI water.<br />

Do not use a solution of greater than 1.0% bisulfite. The pressure<br />

vessel endcaps will be damaged otherwise.<br />

B. Add the correct amount of sodium bisulfite powder to the cleaning tank using the<br />

following proportions:<br />

0.5% solution sodium bisulfite - .042 lbs. per gallon<br />

1.0% solution sodium bisulfite - .084 lbs. per gallon<br />

If applicable, add the appropriate amount of freeze protection (glycerin or<br />

propylene glycol) to the solution at this point.<br />

3-4 USFilter

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