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helgymatt · 01-30-2009, 08:18 PM

Well I can't resist...

Ray, In your thread you say your papaper is published. Where?

You need to explain the CO2=CO2 out theory. And then explain why your tank has the same CO2 everywhere and Tom Barr's does not. Are you saying that because Tom is injecting CO2 at a contant rate during the day, the difference of CO2 concentrations he finds in his tank are only because of time? Do you mean that throughout the day the CO2 concentration will increase and then the CO2 does not get mixed evenly in the tank causing differences in CO2 concentrations? Surely the pump in Toms tank is mixing water throughout the tank and surely some areas of the tank do not get as mixed as well as others.
Please explain why the CO2 controller would be any different than a needle valve injecting the same rate of CO2 24/7 (forget photoperiods and plants for now)

You didn't explain if you have any plants in your tank. It would be nice to know if your tank is a box of water or a planted aquarium with places which may not have as much flow as others.

EDIT: I found how you mixed the water in your tank to get to equilibrium - you stirred it. Seems like a very logical way to equilbrilate the water! I know my tank doesn't stir itself to mix up the CO2 enriched water. I do have a pump for circulation, but I know that back corner and other areas of my tank have hardly NO flow. How would the CO2 measure in those area of the tank?

Also, for the record means and standard errors are not "scientific fact". Maybe you can do some more powerful statistical analysis and then have a stronger case.

And BTW, I am not saying controllers are no good. I'm actually considering buying one. I just don't understand your logic.

01-30-2009, 08:18 PM	#16 (permalink)
helgymatt Senior Member Join Date: Sep 2007 Location: Ames, IA Posts: 831 iTrader Ratings: 33 iTrader Positive Rating: 100% Plant Points: 50000	Re: PH controller vs. Drop Checker Well I can't resist... Ray, In your thread you say your papaper is published. Where? You need to explain the CO2=CO2 out theory. And then explain why your tank has the same CO2 everywhere and Tom Barr's does not. Are you saying that because Tom is injecting CO2 at a contant rate during the day, the difference of CO2 concentrations he finds in his tank are only because of time? Do you mean that throughout the day the CO2 concentration will increase and then the CO2 does not get mixed evenly in the tank causing differences in CO2 concentrations? Surely the pump in Toms tank is mixing water throughout the tank and surely some areas of the tank do not get as mixed as well as others. Please explain why the CO2 controller would be any different than a needle valve injecting the same rate of CO2 24/7 (forget photoperiods and plants for now) You didn't explain if you have any plants in your tank. It would be nice to know if your tank is a box of water or a planted aquarium with places which may not have as much flow as others. EDIT: I found how you mixed the water in your tank to get to equilibrium - you stirred it. Seems like a very logical way to equilbrilate the water! I know my tank doesn't stir itself to mix up the CO2 enriched water. I do have a pump for circulation, but I know that back corner and other areas of my tank have hardly NO flow. How would the CO2 measure in those area of the tank? Also, for the record means and standard errors are not "scientific fact". Maybe you can do some more powerful statistical analysis and then have a stronger case. And BTW, I am not saying controllers are no good. I'm actually considering buying one. I just don't understand your logic. Last edited by helgymatt : 01-30-2009 at 08:54 PM.