So my wines require So2 additions. The problem is More Wines contradicts itself (It think). On pages 64-65 of their PDF file, there is a chart that states that a wine with a PH of 3.5 requires 40 PPM of "free" SO2. but on the next page, it gives another number - 24PPM.

How much "free" S02 is required for a wine with 3.5 PH? My free SO2 is currently at 10, 12 and 8 for the three demis I tested... each is between 3.5 and 3.54 PH

So do I subtract 40 PPM from 12 PPM (and 40-8 and 40-10 for the other two?), which in this case, would give me 28 PPM to plug into their equation?

I am confused! Why do they have two different figures? Is this a typo?

thanks