We produce drinking bottle water in 5US gallon poly carbonate bottles and distribute to consumers.
Our reverse osmosis water has pH level of 5.4 -5.5, would it be right to add the caustic solution to enhance pH of water to 6.9-7.4 ? Can we use any other chemical/material without having any health problems? Please suggest some methods for correcting our water pH level.
RO does not remove dissolved CO2 and that makes the water acidic. I would not recommend to add any chemical to raise pH. Just try to increase the TDS of your RO water a little to a point when you get 6.5 pH minimum, that is the EPA minimum pH for drinking water. Increased TDS will add total alkalinity to treated water and correct the pH.
Dear Inamul, First, what is your source of raw water ? Is it seawter or Brackish water ? Furthermore, in most cases water coming from RO should not be used as drinking water directly as concentration of some minerals are too low, especially magnesium and calcium (there are recommendations of the WHO). In most cases, you should proceed for a remineralisation, which will also correct your pH. There are different solutions, most often using calcium based rock (dolomite or calcite). I would not recommend using caustic soda. Best regards.
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by Patrick Rambosson, Process and Sales Engineer at Lenntech BV
Hi Inamul, We have recently released report on US pH meter Market Forecast & Opportunities, 2020, I hope you would certainly find answer of your query in that. Kindly write me on kalpana.verma@techsciresearch.com to know more about the report. Regards, Kalpana