mcg Posted February 25, 2010 Share Posted February 25, 2010 I have been using Citric acid bath to clean the cooper column. After flushing with water there is a film still on the cooper. What is the best way to get rid of this film. Link to comment Share on other sites More sharing options...
BWFiggins Posted February 25, 2010 Share Posted February 25, 2010 I have been using Citric acid bath to clean the cooper column. After flushing with water there is a film still on the cooper. What is the best way to get rid of this film. Try using caustic soda (sodium hydroxide) then follow it with the citric acid. If caustic soda is undesirable, then a more gentle soda ash (sodium carbonate) can be used before your final citric acid rinse. The citric acid completely neutralises any residual caustic soda or soda ash. Link to comment Share on other sites More sharing options...
mcg Posted February 25, 2010 Author Share Posted February 25, 2010 Try using caustic soda (sodium hydroxide) then follow it with the citric acid. If caustic soda is undesirable, then a more gentle soda ash (sodium carbonate) can be used before your final citric acid rinse. The citric acid completely neutralises any residual caustic soda or soda ash. Thanks BW for the info. Link to comment Share on other sites More sharing options...
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