Ask Mr. Wizard

Pre-Boil vs. Post-Boil Water Ion Concentrations

TroubleShooting

Jimmy Fortin — Montreal, Quebec asks,
Q

I’ve been researching water chemistry for brewing and I haven’t found an answer to my question. When you are planning for the chemistry of the water, do you target the ratio of the chemistry pre-boil or post-boil? Do the minerals evaporate out of the water or do they concentrate in it? This question has been bothering me, one of your fervent readers, for a while.

A
This is a really good question. Water chemistry is discussed in terms of pre-mash concentrations with minimal attention given to the concentration of ions following mashing (and boil). Perhaps the primary reason
Response by Ashton Lewis.