2 weeks for prazipro followed by 30 days with copper. And I totally understand that UV simply slows down spread but does not eliminate.And how long did you treat.
Also understand UV helps but is not an eraser. It will address free floating organisms and what passes through the unit and not address what is preexisting. You can still have disease with a UV unit. Mucus cones are raised white con shaped spores but lets get this confirmed BEFORE making any protocols or treatments.