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[APD] Most tapwater has little CO2

SH: "Not all tap has a lot of CO2 in it and in places where it does, it's not all year round."

This thread started with someone using well water and then got smudged over into a general discussion about water changes providing CO2 that might include any tapwater. Most municipal water systems try to remove as much CO2 as possible because they want the water to be less acidic on the pipes. Our water comes out of the tap at pH 9.8, but then drops to pH 7.6 when left out as it absorbs CO2 from the air. So doing water changes with water directly from the tap in an effort to provide CO2 would be counter-productive. All tapwater isn't the same.


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