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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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