Advantages:

• AWC C-237 is a concentrated liquid formulation designed for use as a high pH cleaner of polyamide thin film composite membrane surfaces.
• AWC C-237 works to remove the most stubborn biofilms and organic foulants.
• AWC C-237 supports the cleaning of acid insoluble sulfates of calcium, barium and strontium as well as calcium fluoride.
• AWC C-237 is especially effective in removal of metal oxide deposits when used in a pH range of 9 – 10.5.
• AWC C-237 is buffered so as not to exceed a pH of 12.
• AWC C-237 may eliminate need for repeat cleanings where severe fouling exists.
• AWC C-237 is NSF approved for use as a membrane cleaner in potable water systems.
• AWC C-237 is compatible with all Thin Film Composite R.O. membranes from all major membrane suppliers.

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

Chemical Feeding and Control:

• The cleaning solution should be prepared using potable water that is free of residual chlorine or other oxidizing agents. Add 2 Gal of AWC C-237 to every 100 gal of water (2 % solution).
• Adjust the pH in the range 10 – 11.
• Recirculate the cleaning solution throughout the system, after redirecting the first 20% of the solution to drain.
• Do not exceed pressures, temperatures and flow rates recommended by the membrane manufacturer.
• Cleaning efficacy can be further improved by heating the cleaning solution and alternately circulating the solution for 15 minutes and then soaking the membranes for 15 minutes.
• This should be repeated as many times as necessary.
• pH range should be monitored periodically throughout the cleaning. When pH drops below the desired range, it should be adjusted by adding more AWC C-237.
• Optimal iron removal occurs at pH of 8.5 – 10.5

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.

Packaging:

• C-237 is packaged in 5 Gallon plastic containers. Other packaging is available upon request.