Interesting! Thanks for sharing.
I found it for $109. Still quite expensive. But at roughly 4.4ml per liter a 200ml bottle should make up a decent number of batches.
https://www.pestrong.com/1913-alesco-anti-ethylene-treatment-200-ml-676-oz.html
Looks like the bottle has a shelf life of 18 months, and once you mix it into water they say to use it within 3 days (so you’d want to only mix up what you planned to use, obviously)
I wonder if it’s safer to spray than STS? (not that STS is that unsafe or anything)