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dennis · 09-28-2006, 07:38 PM

I believe you'll find that ADA tends to worry more about pH and less about CO2 levels in ppm. As Gomer posted in another thread, the drop checker will do basically what you said.....high. low or just right but only as a function of the CO2 displacement from the water in the tank to the RO/DI water in teh drop checker. The interface there is via CO2 comming out of solution from the tank and being absorbed by the RO?pH indicator solution in the checker.

I guess in theory it would be a good indication of CO2 levels , providing 1) the color is easy to read consistantly in the tank and 2) that the "good" level at pH 6.0 (or whatever) is an indication of the CO2 level you want in relation to its absorbtion in the RO water. This also assumes that the CO2->bicarbonate->carbonate relationship plus the effects of CO2 in tank water due to organic acids will mot make a difference on how much CO2 dissociates from the tank to the checker.

Chimestry that is saddly beyond me at this time.

09-28-2006, 07:38 PM	#2 (permalink)
dennis Senior Member Join Date: Mar 2004 Location: Leverett, Mass Posts: 2,959 iTrader Ratings: 46 iTrader Positive Rating: 100% Plant Points: 39495	I believe you'll find that ADA tends to worry more about pH and less about CO2 levels in ppm. As Gomer posted in another thread, the drop checker will do basically what you said.....high. low or just right but only as a function of the CO2 displacement from the water in the tank to the RO/DI water in teh drop checker. The interface there is via CO2 comming out of solution from the tank and being absorbed by the RO?pH indicator solution in the checker. I guess in theory it would be a good indication of CO2 levels , providing 1) the color is easy to read consistantly in the tank and 2) that the "good" level at pH 6.0 (or whatever) is an indication of the CO2 level you want in relation to its absorbtion in the RO water. This also assumes that the CO2->bicarbonate->carbonate relationship plus the effects of CO2 in tank water due to organic acids will mot make a difference on how much CO2 dissociates from the tank to the checker. Chimestry that is saddly beyond me at this time.