Bill,
If you are looking for the 0.75 : 0.25 : 1.0 of the SS then I believe the Math is as follows. If you are looking for one of the other formulations then just subtitute in the equations:
KNO3: 20.38g used, 101.11g/mol 20.38/101.11 = 0.20156 (our multipier for KNO3)
Breakdown:
K: 39.10g/mol * 0.20156 = 7.88g of K used
NO3: 62.01g/mol * 0.20156 = 12.50g of NO3 used
KH2PO4: 5.97g used, 136.07g/mol 5.97/136.07 = 0.04387 (our multiplier for KH2PO4)
Breakdown:
K: 39.10g/mol * 0.04387 = 1.715g of K used
H2: 1.0g/mol * 0.04387 = 0.088g of H2 used
PO4 94.97g/mol * 0.04387 = 4.166g of PO4 used
K2SO4: 15.74g used 174.27g/mol 15.74/174.27 = 0.09032 (our multiplier for K2SO4)
Breakdown:
K2: 78.2g/mol * 0.09032 = 7.06g of K2 used
SO4: 96.07g/mol * 0.09032 = 8.68g of SO4 used
So here is How it adds up
NO3: 12.50g
PO4: 4.166g
K: 7.88g + 1.715g + 7.06g = 16.655g
If you substitute in KCL it has a lower Formula weight but it also has less K per molecule. You need to substitute KSO4's 7.06g of K for KCL's 7.06g of K:
KCl: Xg used 74.55g/mol X/74.55 = Y (Y is our multiplier for KCL)
Breakdown:
K: 39.10g/mol * Y = 7.06g of K used
Cl: 35.45g/mol * Y = Z
Solve for XY and Z
39.10 * Y = 7.06 Y= 0.18056
X/74.55 = Y (Y = 0.18056) so X = 13.46g of KCL
For fun solve for Z:
35.45 * Y = Z substitute in Y and Z = 6.40
there will be essentially 6.4g of Cl- floating around your tank (by the time you finish your fertilizing) so I don't know if this is a good idea
Dose the fertilizer exactly like Edward says: 1ml/10gal
P.S. if anybody finds a flaw with my math (such as Edward) please let me know
Ken T.