K2so4 Too High For Pps-pro

markStephens

New Member
Aug 1, 2019
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maryland, usa
Hi, Old hand at aquarium (1st plant tank in 1990's), new to dry fertilizers. The calculator is set for the following "20 us gal", "a solution", 500 ml container size, 15 ml daily dose, "Perpetual Preservation System". In the spreadsheet screen capture below, the top ("barr") has values directly from the calculator; the bottom ("nilocg") has values from the nilocg website, given as "gm orig.".

I'm using the percent ratios as a sanity check and indeed the potassium sulfate from the calculator is high. I'm assuming (bad idea?) that the combined values of potassium should decrease the amount of K2SO4. The calculator does not take this into account, which I hasten to add, is not its intent. However...

Isn't this misleading? Perhaps a note on combined effects?

mark
markStephens calc pict.png
 

markStephens

New Member
Aug 1, 2019
3
0
1
67
maryland, usa
Hi and thanks for the replies!
I'm (so far as I can tell) using the values listed at Edward's site, scaled for a dose of 15 ml into a 20 gal tank. The ratios of all four are the same as are the target ppm. I have those dosing bottles and find 15 ml easy to squeeze out a dose. The actual weights currently being used are shown below.

What would be terrific is to enter the desired ppm of K, N, etc. and a list of salts being used so it could account for the accumulated potassium from all three potassium bearing salts.

mark

markStephens ferts pict.png