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When the water comes out of the tap with a higher pH than it has upon standing, it probably means that the water company has dosed it with lime (Calcium hydroxide) to reduce how much it dissolves the pipes. When I was in Boston, in the late 60's they got their water from granite reservoirs and didn't add any lime. The pH out of the tap was around 6, and there was 5 ppm of copper, enough to be lethal for most tank inhabitants.

In central Mississippi, the water comes out of the tap with a pH of 8.3 and it rises to about 8.6 upon standing. This is due to a large amount of sodium bicarbonate in the water and almost nothing else. With my test kits, Ca, Mg, K, and PO4 are zero. All that sodium bicarbonate is not good for much, and it slows down the uptake of badly needed calcium into the water from limestone or snail shells. I prefer to work with rain water. Fortunately, it rains a lot here.
 
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