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Old 09-28-2006, 07:24 PM   #1 (permalink)
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The ADA drop checker is a very interesting and nice looking device, but it is not in stock now. Do you have any idea when it will be available?

Does it measure ppm of CO2 independent of the parameters of the water in the tank? By that I mean does it bypass the problem of things like tannic acid from wood, or alkalinity from phosphates in the water?

The website illustration suggests that the only levels it indicates are: too little, too much, and adequate CO2. Is this true? If so, what ppm does adequate correspond to?
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Old 09-28-2006, 07:38 PM   #2 (permalink)
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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.
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Old 09-28-2006, 07:39 PM   #3 (permalink)
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Hoppy,
Enough warning and I can pick up one of these for you before I leave for the airport in 24 hours.
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Old 09-28-2006, 08:37 PM   #4 (permalink)
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Dennis is right, as long as the ph of the water is 6.8-7.0 ADA is very happy.
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Old 09-28-2006, 08:46 PM   #5 (permalink)
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Quote:
Originally Posted by turbomkt View Post
Hoppy,
Enough warning and I can pick up one of these for you before I leave for the airport in 24 hours.
Thanks for the offer, but I'm only interested in it if it truly does measure the amount of CO2 in the water, and can be read reasonably accurately. I also emailed ADG with essentially the same questions.
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