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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.
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
> 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.
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