Fraid not ... I use K₂HPO₄ rather than KH₂PO₄ . ... Why ? I know that EI dosing is based on always oversupplying nutrients, but given my experience with high phosphate levels in the past (via water supply) then I'm going for the lower end of the phosphate range, and also for nitrate, as low nitrate levels promote deeper reds in red plants ... as soon as I can stop my Alternanthera reinekii from melting away ... The ludwigia is growing well thoughGald the calculator has been of use.
@Zeus. is also working on a specific RemiCalculator sheet for the IFC calculator but he has been busy lately. Once he is done it, it will be my turn to sprinkle some magic powder on it. This said the "BespokeRemi (R)" option in the TargetCalculator can be used as a proxy for that in the meantime.
Well there is Monopotassium Phosphate (also known as monobasic potassium phosphate) already in the calculator. Isn't that what you want?