Resources & References
Here's a site with great wine making calculators and other solid information: www.vinoenology.com
A Sulfite Calculator can be found here: www.winemakermag.com/guide/sulfite
Click here to view a handy chart which illustrates how much Free SO2 is needed depending on wine pH.
For water, soil or tissue analysis, contact Dellavalle Laboratory: http://www.dellavallelab.com/ or 800.228.9896