AWC C-219 -Silica cleaner
Silica Cleaner (Liquid)
A unique membrane cleaner that dissolves heavy silica deposits that would otherwise not be able to be removed. Silica scales often form into hard and tenacious glass like scales that cannot be removed excpet with the highly toxic hydrofluoric acid. This is a safe and non-corrosive alternative to hydrofluoric acid to remove these scales. Additionally, the product is formulated at pH 5 to not be rated as DG for transport.Â
Clear, colourless liquid, completely water soluble.
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Advantages
- Dissolves glassy and colloidal silica, alumino-silicate scalesÂ
- Effectively dissolves and chelates iron, aluminium and other metal oxides and hydroxides
- Formulated to prevent calcium fluoride scaling during use
- Does not contain ammonium bifluoride or hydrofluoric acid
- Stabilised fluoride formulation does not cause chemical burns
- Compatible with all Thin Film Composite R.O. membranes from all major membrane suppliers
- Certified by NSF to NSF/ANSI Standard 60.
Packaging
- 20L pails
- 200L non-returnable plastic drums
- 1000L IBC
Safety and Handling
Store in a cool, dry and well-ventilated area. Keep containers closed. Always use safety goggles, gloves and other PPE listed in the Safety Data Sheet when handling. Wash contaminated clothes before re-use. Wash thoroughly after handling. For more information, see the Safety Data Sheet provided with this product.
Chemical Feeding and Control
- Use potable water that is free of residual chlorine or other oxidizing agents to make the cleaning solution. Add 2 % by weight AWC C-219, and mix.Â
- The pH should then be adjusted down to 2 – 2.5 range using any organic or inorganic acid that is compatible with the membranes (avoid sulphuric acid if calcium carbonate scaling is suspected).Â
- Circulate the cleaning solution throughout the system without exceeding pressures, temperatures and flow rates recommended by the membrane manufacturer.Â
- Cleaning efficacy can be further improved by heating the cleaning solution and alternately circulating the solution for 1 hour and then soaking the membranes for 30 minutes for a total cleaning time of 3–6 hours.Â
- The pH should be maintained in the range of 2 – 2.5 throughout the entire cleaning process. Depending on severity of fouling, your Membrane Works representative will recommend optimal cleaning times.
