Taken from: https://www.homebrewtalk.com/forum/threads/fresh-squeezed-ipa.223815/
Approximately 2.5 grams of gypsum in strike water, 1.5 sparge, and .5 gram in boil; 1 grams of calcium chloride in strike and sparge. Long and heavy boil due to low OG. Still getting use to smaller batches.