PPS Pro. Spreadsheet vs Nutrient Calc - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 06-25-2012, 03:50 AM Thread Starter
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PPS Pro. Spreadsheet vs Nutrient Calc

Weird discrepancy I've noticed when looking at the two. The PPS Pro solution spreadsheet says:

TE (Millers): 80g

MgSO4: 41g
KH2PO4: 6g
KNO3: 65g
K2SO4: 59g

Yet, using the "Yet Another Nutrient Calculator," calculating a solution for a 25G tank, using a 1L bottle and 2.5mL's per dose (ie, 1mL per 10g), we are given different results:

(Using rounded figures)

TE (Millers): 95g

MgSO4: 38g
KH2PO4: 7g
KNO3: 62g
K2SO4: 112g (with a recommended dosage change due to solubility issues)

How is this possible exactly? Some are close, yet the K2SO4 is extremely off. What am I missing?
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post #2 of 2 (permalink) Old 06-25-2012, 01:58 PM
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The value calculated in Wet's calculator looks to be off by a factor of 2. This suggests to me that the mole ratio is simply not accounted for in the calculation; a simple mathematical error so that it's suggesting twice as much K2SO4 as you really need. (i.e. the addition of K2SO4 yields 2 mols of K, not 1 mol.)
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