"Best"? I think it all depends on what fish are in there, and the water quality. It sure is probably the fastest way. It isn't required to do it even once a year. It all depends on your goals for the pond, and the depths of your pockets. wink

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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).