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New PMDD confusion
Pat Bowerman posted:
>The last e-mail that I received from Kevin Conlin listed the "new"
>formula as follows:
>1 Tablespoon Trace Element Mix
>2 Tablespoons KNO3
>2 Tablespoons K2SO4
>1 Tablespoon MgSO4 (epsom salt)
>Dissolve the trace element mix in 150ml of distilled water, then add
>the remaining ingredients. Add an additonal 150 ml of water to make a
>300 ml solution.
And Tim Mullins posted:
>Conlin and Sears' latest PMDD formula:
>mix with water to make a 1/2 liter solution,
> 1 tablespoon chelated trace mix
> 1 tablespoon MgSO4+7H2O
> 2 tablespoons K2SO4
> 1 tablespoon KNO3 (more or less, depends on nitrate)
I can already hear someone wanting to try PMDD asking "do you make a
300 ml solution or a 500 ml solution?" Also, the "old" recommended
dosage was 3 ml/100 liters, or 1.1 ml/10 gallons, which resulted in a
3 ppm NO3 concentration for me. Using the new formula (one tbsp KNO3
in a 300 ml solution), I should be dosing at 1 ml/100 liters to give
me the same NO3 concentration, but a 500 ml solution would require
1.67 ml/100 liters. Yes, it's the same amount of KNO3, but tough for
someone starting out.
The new recommended dosage of 1/12 ml/10 gallons (from a 500 ml
soultion, 1 tbsp KNO3) would be about 1/8 of the original dosage
recommendation, and would result in 0.4 ppm NO3 for me. Shouldn't it
be 0.63 ml per 10 gallons, or 1.67 ml/100 liters? I thought the
purpose of the new formula was to increase the macronutrients, not
decrease them.
Is my math off? Am I off? I understand we each need to tailor PMDD
for our aquariums, but these new dosage recommendations seems to be
low. Anybody else want to give it a shot?