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The evidence is that tomonts are impervious to formalin. Trophonts, similarly, are not killed by formalin but are driven off the fish with sufficient exposure time.
Do you have some material I can read regarding how effective formalin is at eradicating/driving off trophonts?
This source primarily discusses using it to "control" parasites: http://fisheries.tamu.edu/files/2013/09/Use-of-Formalin-to-Control-Fish-Parasites.pdf