[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [APD] Estimative Index for CO Dosing - Bah!
Vaughn Hopkins wrote:
> This intrigues me. I'm going to get out the kits again and try to see
> if I can apply this. So, if I let a tank sample of water sit
> overnight, test the PH, and from that, figure the KH assuming 4 ppm of
> CO2 is in the water, that will be the true carbonate contribution to
> the KH, and the KH I should use with the tables to determine my CO2 ppm
> from a tank sample taken during the day? Assuming this is accurate
> enough why wouldn't this be the preferable way to check CO2 all of the
> time? I would certainly prefer to know my CO2 level more accurately
> than by using the fish misery test.
Well, it would be nice if we could figure out some way of independently
verifying the accuracy of the results, but I think it's at least better
than using the fish as living CO2 test kits.
> That suggests to me that the KH/PH/CO2 table can be changed to a PH
> overnight/PH during the day/CO2 table, and not even have to measure KH
> except to make sure it is high enough to avoid PH crashes.
It doesn't invalidate the relationship, in fact it affirms it. All you
are really doing is measuring a known quantity of CO2 and then adjusting
the curve of the KH/pH/CO2 relationship to match observations. It
doesn't change anything.
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com