I used the burlap bag method also. Seems to be working pretty quickly, faster than I thought it would. Found a dead crawdad, and tadpole the next day. I know that’s hardly anything, but I didn’t think the copper sulfate would hurt anything but the FA..
9 yr old pond, 1 ac, 15' deep. RES, YP, GS, FHM (no longer), HBG (going away), SMB, and HSB (only one seen in 5 yrs) Restocked HSB (2020) Have seen one of these. I think that's about all I should put in my little pond. Otter attack in 2023