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RE: PMDD Dosing
PMDD Dosage Calculations
Having just gone through this exercise, I thought someone else could use it
also.
From the "original recipe" in "Control of Algae in Planted Aquaria" by Sears
and Conlin
Chem Vol Mass (g) K N S Mg Fe Mn
B Zn Cu Mo
K2SO4 2 tsp 14 0.45 0.18
KNO3 1 tsp 6 0.39 0.14
MgSO4+7H20 2.5 Tbsp 33 0.13 0.1
CTEM 1 Tbsp 9 0.07 0.02
0.013 0.004 0.001 0.0006
Elemental Mass (g) 8.64 0.84 6.81 3.3 0.63 0.18
0.117 0.036 0.009 0.0054
Daily Dosage in (mg/L) 0.864 0.084 0.681 0.33 0.063 0.018
0.0117 0.0036 0.0009 0.00054
The daily dosage was calculated by
dd = x / s * d * 1000 (mg/g) / t
where
x = elemental mass (g)
s = solution volume (ml)
d = daily volume (ml)
t = tank volume (L)
From the paper a good starting place for iron is
dd = 0.63/300*3*1000/100 = 0.063 mg/L
I am currently using chemicals from Homegrown Hydroponics and my recipe for
my tank is
(note that the densities of some of the chemicals are different)
Chem Vol Mass (g) K N S Mg Fe Mn
B Zn Cu Mo
K2SO4 2 tsp 14 0.45 0.18
KNO3 1 tsp 7 0.39 0.14
MgSO4+7H20 2 Tbsp 30 0.13 0.1
CTEM 1 Tbsp 12 0.07 0.02
0.013 0.004 0.001 0.0006
Elemental Mass (g) 9.03 0.98 6.42 3 0.84 0.24
0.156 0.048 0.012 0.0072
Daily Dosage (mg/L) 0.5178 0.0562 0.3682 0.1720 0.0482 0.0138
0.0089 0.0028 0.0007 0.0004
The daily dosage was calculated by
dd = x / s * d * 1000 (mg/g) / (t * 3.875 (L/gal))
where
x = elemental mass (g)
s = solution volume (ml)
d = daily volume (ml)
t = tank water volume (gal)
For example
dd = 0.84/100*1*1000/(45*3.875) = 0.0482 (mg/L)
Regards,
Harold.Walters at halliburton_com