The original recipe is at this link to a msg in another thread on the web site which was about a different issue. It was mentioned as a way to help control and reduce Powdery Mildew problems.@Bill284 happen to have a recipe for that??
I’ve had rot the past 2 grows and do NOT want it again
https://www.420magazine.com/community/threads/thrips.512473/post-5519939
It is in metric but easy enough to adjust to US Imperial measurements.
5 grams Citric Acid to 500 ml of distilled water is 5 grams to a US pint. Do not forget the drops of liquid dish soap which acts as a spreader and sticker for the solution.
I spooned out some of the Citric Acid several times and weighed it. The 5 grams kept coming out to 1 and 1/4 teaspoons or one gram per 1/4 teaspoon.
The Citric Acid I currently use is this one so if using another brand weigh it out to be sure it mixes up the same. It probably will but best to double check.