Isothiazolinone CMIT MIT has low concentration, lower toxicity and high operational safety; it can be directly used for daily maintenance addition, or it can be compounded with oxidizing fungicides or quaternary ammonium salts.
https://www.hoochemtec.com/news/navigating-isothiazolinones-sourcing-in-2026-a-manufacturers-guide-to-global-compliance-and-supply-stability/