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Re: [APD] CO2 measurement revolution in the plant tank hobby

I just heard of the membrane CO2 diffusers last night, so I have no  
idea what their reputation is.  I do notice that they are still being  
offered for sale.  What is their reputation?  If a membrane based CO2  
measuring device would work dependably for a week or longer, that  
could still be a very economical device.  My image of such a device  
differs from Tom's because I relate to those who couldn't afford a pH  
monitor (like me).  I see such a device being a lens shaped,  
approximately one half inch diameter plastic throwaway, with  
reference KH fluid plus indicator solution in it, all held by a  
suction cup to the tank wall.  The throwaway part shouldn't be at all  
expensive, being easy to mass produce.  It would only require that  
the membrane be semi-transparent so the color would show through.   
Replacing that part once a week should be economical.

Vaughn H.

On Nov 29, 2006, at 7:55 AM, Liz Wilhite wrote:

> Yep -- probably 1 - 2  weeks.  The reason I say this is that activated
> charcoal generally becomes inactive within a week to 2 weeks in an  
> aquarium
> due to pores being clogged or covered with a biofilm.  And then  
> there is the
> really bad reputation of membrane based CO2 dispensers.
> On 11/29/06, Vaughn Hopkins <hoppycalif at yahoo_com> wrote:
>> Are you saying that algae/bacteria/etc. would grow on the membrane,
>> thus closing off its pores?  Do you have any feel for the time
>> involved before this would be a factor?
>> Vaughn H.
>> On Nov 29, 2006, at 4:53 AM, S. Hieber wrote:
>>> A problem with membranes in aquaria or "standing" water is that
>>> biofilm mucks them up. If you're envisioning a continuously
>>> operating device, that might be an issue.
>>> sh
>> _______________________________________________

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