I'll go test an area in my pond this morning and report back. My gut feeling is that if the FA is actively growing, then it will work, but since I've never used it in that water temp I hesitate to give an answer. I'll let you know in a few days.


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).