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Z Series RO System by GE Osmonics
There are a variety of indications for cleaning membranes. The most common is a
reduced product flow rate. Remember that a reduction in inlet water temperature can also
result in a reduced flow rate. Refer to Technote 113 "Temperature Correction Factors" to
determine the reduction in flow that can be attributed to reduced water temperature.
Clean the membranes whenever the temperature compensated flow rate drops by 10%. A
loss in the membrane performance (percent rejection) or increase in TDS of the product
water may also be an indication to clean the membranes. A good preventative
maintenance practice is to clean the membranes on a quarterly basis, and more often if
needed.
4.3.1 Cleaning Preparation
There are two types of cleaners available, a low pH cleaner (Calcium/Iron removal) and a
high pH cleaner (Silt/Organics removal). GE Osmonics provides these cleaners in liquid
form. The low pH cleaner attacks mineral scale deposits such as calcium, magnesium
and iron build-up, and should be used first. The high pH cleaner will remove
accumulated silt and organic matter from the RO membrane.
WARNING:
The solution is a mild irritant to eyes and skin. It is recommended that protective gloves
and eye protection be worn when handling the cleaner. Follow all applicable Material
Safety Data Sheet (MSDS) precautions and OSHA Standards.
WARNING:
Label machine with appropriate warning signs such as "Do Not Use / Contains Cleaner"
to prevent use of the RO until it is properly rinsed.
CAUTION:
The different cleaners must not be mixed together. Introduce the low pH cleaner first,
thoroughly rinse the system, and then use the high pH cleaner.
NOTE:
BIOSAN™ is a low pH liquid cleaner/descaler agent intended for use in removing
mineral scale and organic biofilm and is a short-term storage solution for RO water
systems.
NOTE:
Follow the procedures recommended by cleaning solution manufacturer if they vary from
the following steps.
Cleaning Materials
Description GE Osmonics Part Number
Disinfection/Cleaning Kit 12214
Low pH liquid 1228653 (1 Gallon) or 1228654 (5 Gallons)
High pH liquid 1228791 (1 Gallon) or 1228792 (5 Gallons)
Water Quality Test Strips 1232143
“DO NOT USE” Warning Labels Not Provided by GE Osmonics
Operation Log Sheets Reference Tech Note 142
Cleaning/Disinfect Log Sheets Reference Tech Notes 143, 144, 145
1238339b – 16Oct03 4 - 10 Routine Maintenance