Your Friendly Neighborhood Evil Plant Monster PITA
Hi Daniel,
This is one of “those” calculator problems.
We start with a built-in error of the difference between the mass of the solvent (distilled or deionized water) and the mass of the solute (salts).
I am reasonably sure in your example you used 1-liter as the solution rather than the 1.1–liters that Tom Barr is actually prescribing.
(For the record, I think Tom meant 1-liter total solution, but I will leave that issue to him.)
To be honest I do not think these numbers are very important when dosing fertz, the real problem comes when dosing medications and various treatments where a very small error can mean the difference between cure and catastrophe. :gw
Biollante
Hi Daniel,
This is one of “those” calculator problems.
We start with a built-in error of the difference between the mass of the solvent (distilled or deionized water) and the mass of the solute (salts).
For the purposes of very dilute solutions, they can, and we do consider them equal and this works very well in our aquariums
where we typically are in the 0.00005% to 0.0030% concentration range.
As the solution concentration, raises into the stock concentration ranges as in this example of almost 9.1%,
the difference in mass of the solvent and combined mass of the solute start to be noticeable.
where we typically are in the 0.00005% to 0.0030% concentration range.
As the solution concentration, raises into the stock concentration ranges as in this example of almost 9.1%,
the difference in mass of the solvent and combined mass of the solute start to be noticeable.
I am reasonably sure in your example you used 1-liter as the solution rather than the 1.1–liters that Tom Barr is actually prescribing.
(For the record, I think Tom meant 1-liter total solution, but I will leave that issue to him.)
To be honest I do not think these numbers are very important when dosing fertz, the real problem comes when dosing medications and various treatments where a very small error can mean the difference between cure and catastrophe. :gw
Biollante
DanielSev;75639 said:Hi Wet, I must recheck everything before ask ! Anyway there is something that confuses me: if you follow the guidelines given by Tom in:
http://www.barrreport.com/showthread.php/3209-Want-more-accuracy-Want-daily-PMDD-style-EI-dosing
you have that if you want to dose 12 ml daily from a 1000 ml solution for a 20 Gal tank the necessary quantities are:
However if you set the same conditions in your calculator you get that you have to add 25.718 of KNO3 to get 2.5 ppm (I use KNO3 only as an example) which plotted for three months/7 times a week/50% weekly WC let the "no uptake" trend spikes slightly over 30 ppm. The quantities suggested by Tom gives a total of 6 ppm for KNO3 which if dosed daily yields spikes over 80 ppm for that same trend. Is there any error on this ??
Again, thank you for your wonderful tool.