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My understanding is that prazi works within 30 minutes of entering the water, and is gone entirely (at least what remains does nothing to kill the parasites) within 24-48 hours anyway.
@Humblefish can you confirm?
The fish needs 24 hrs of exposure time for prazi to work its magic. 72 after you dose prazi it's all gone, except for the solubilizing agent (Oxybispropanol).






