03-12-2008, 09:40 PM
Join Date: Apr 2005
Location: Brentwood, CA, USA
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| | Re: How fast does CO2 levels raise?
For a 5 gallon tank, with 2 bubbles per second of CO2, and a reasonably good method for dissolving CO2 into the water, no excessive surface disturbance, I would expect to reach equilibrium on CO2 concentration within 2 hours or less, probably much less.
Your results will mean a lot more if you start with 5 gallons of distilled or deionized water from the grocery store - about $6 worth - and add about 1/16th teaspoon or less of sodium bicarbonate (baking soda) to get a measurable KH. Then the chart of CO2 ppm vs pH and KH would be much more accurate.