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Joined: Mar 2005
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Moderator Hall of Fame 2014 Lunker
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Cecil that is noted in the chart (dark line - high alkalinity - little change). No way to know that without repeated ph tests over an extended time or an alkalinity test. IMO if he has super high alkalinity it is from a source other than the concrete as it takes high acid water (in fish terms) to break down the concrete. My guess is low alkalinity water with high ph swings due to low buffering is the cause of the 9.2 reading and it is not caused by the concrete.
sdstohler what time of day was the ph test done and was it a clear sunny day ?
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