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**To**:**aquatic-plants at actwin_com****Subject**:**New PMDD confusion****From**:**mark.fisher at tpwd_state.tx.us**- Date: Wed, 09 Apr 97 13:08:10 cst

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?

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