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Re: Aquatic Plants Digest V4 #878

In a message dated 3/3/01 3:50:41 PM Eastern Standard Time, 
Aquatic-Plants-Owner at actwin_com writes:

<< Put some aquarium water in a soft-drink bottle (1/4 full), test the 
 pH, shake the water vigorously (with the cap on), test pH again.  If the pH 
 drops a lot, you have plenty of CO2, something else is wrong.  If the pH 
 doesn't drop at all, either you have next to no CO2 or the kit is ng.  HTH.
 could someone explain the chemistry thats happenign here...i am curious but