Re: [APD] CO2 takes awhile to make drop checker green

[Mike Szilard <szilard at sbcglobal_net>]

On 8/15/2007 9:12 AM Dave Gomberg said the following:
> At 09:00 8/15/2007, aquatic-plants-request at actwin_com wrote:
>   
>> I'm going to guess not enough CO2?  2 bubbles per second isn't much for
>> a tank that size.    --Mike
>>
>>     
> I would propose this is due to a high kH and hence the ability to 
> take up a fair amount of CO2 before the pH changes much.   But I 
> could be wrong....
>
>
>
>   
Dave,
I thought that was the whole idea of the drop checker.  It has its own 
KH (usually 4 or 5 dKH) so that it isn't significant and there won't be 
a delayed response other than the previously mentioned transfer of CO2 
from tank water, to air in the drop checker, to the water in the drop 
checker.


For the other comment on 120bpm being plenty for a 100g tank, I'd say 
there are plenty of factors.  How efficient is the reactor?  How much 
surface disturbance is there to off-gas CO2?  How far is the drop 
checker from where CO2 is introduced into the tank?  Is there good even 
water movement so CO2 gets around the tank completely? 

At 2 bubbles per second it's entirely possible it takes that long for 
this particular tank to reach 30ppm of CO2.

-- 
Mike Szilard

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