[APD] Most tapwater has little CO2

["Tom Wood" <tomwood2 at flash_net>]

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.

TW 


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