AWC C-437

Multi-Media Filter Cleaner

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Advantages

• AWC C-437 is a concentrated liquid formulation designed for use as a high pH cleaner of ultrafiltration and microfiltration membrane surfaces.
• AWC C-437 works to remove the most stubborn biofilms and organic foulants.
• AWC C-437 is especially effective in removal of metal oxide deposits when used in a pH range of 9 – 10.5.
• AWC C-437 is buffered so as not to exceed a pH of 12.
• AWC C-437 does not cause chemical hydrolysis of polypropylene and PVDF membranes.
• AWC C-437 is compatible with most MF/UF modules

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Typical Properties

Appearance …………………………….. Clear Colorless to Light Yellow Liquid

Odor ……………………………………… Slight Characteristic Odor

pH (as is) ………………………………… >12

Specific Gravity ………………………… 1.1 ± 0.1

Water Solubility ……………………….. Completely Soluble

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Chemical Feeding and Control

The cleaning solution should be prepared using potable water that is free of residual chlorine or other oxidizing agents. (RO permeate or DI water is preferred).  Do not use hard water.  Add 1 – 2 Gal of AWC C-437 to every 100 gal of water ( 1 – 2 % solution) , depending on severity of fouling. The water must be heated to the maximum temperature allowed by the module manufacturer.   Adjust the pH to the highest pH allowable by the membrane manufacturer.  If pH needs to be adjusted downwards, use  HCl (31% Muriatic acid) and add only 0.1% by volume at a time.  Mix thoroughly by recirculation before checking pH, and repeat addition as necessary.  If pH needs to be adjusted upwards, use NaOH (50% Caustic Soda) and add only 0.1% by volume at a time.  Mix thoroughly by recirculation before checking pH and repeat addition as necessary. The cleaning solution should then be circulated throughout the modules with the filtrate valve closed, in the feed direction for 30 min (for tubular designs). Reverse the direction of the flow and recirculate for 30 more minutes.  Repeat as necessary until desired cleaning results are achieved. AWC C-437 should be added as necessary to the cleaning solution to maintain the pH range. Optimal iron removal occurs at pH of 9.0 – 10.5. For the systems that allow back flushing may be back flushed with cleaning solution from the filtrate to the feed for 15 minutes. After the cleaning is finalized the modules must be flushed with MF/UF filtrate.

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Safety and Handling

Store in a cool, dry and well ventilated area.  Keep containers closed.  Wash contaminated clothes before re-use.  Wash thoroughly after handling.  Please see MSDS for more details.

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Packaging

AWC C-437 is packaged in 55 Gallon or 5 Gallon plastic containers.

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