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Corrective action on pH violation

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Posted 07 December 2019 - 04:39 AM

Hi all, 


water (municipally sourced) is our main ingredient to produce product, . One day, the local authorities came to our factory to check the water  pH and surprisingly the reading is out of spec. So what are the corrective action we should do on this matter?  


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Posted 07 December 2019 - 10:46 AM

Assuming this is direct from the municipal supply, who's spec is it outside - theirs or yours?

For the former, the corrective action arguable rests with them as your supplier - you will want details of what they're doing about it. Is it significantly out of spec, and might it cause or indicate a problem? Can they provide monitoring data over a period of years so you can at least get a feel for how significant the shift is? Don't know where you are based and how things are set up, but we can relatively easily obtain full reports of annual chemical and micro testing for our municipal supply area.

In the first instance I'd try to get hold of someone in the analytical/technical department at the water authority with whom you can talk through the issue.


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Posted 07 December 2019 - 01:43 PM

Seems to be interlinked with this previous recent OP (where spec = 6.5 - 8.5)  -




The obvious questions -


(a) pH of input = ? (measured how ?)

(b) pH of output = ? (measured how ?)(presumably same method as for input ?)


I am no freezing water expert but seems rather likely that (a) will (approx). = (b) ?


So I anticipate (a) will be out of spec also ?????


PS -  IMEX metropolitan water usually does meet the above quoted specs.

Kind Regards,



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