My AP is probably 4 years old and other than replacing the battery, and feeding too much 500 (a reducing plate fixed the problem - Thanks Greg!) I haven't had any problems with 500 or 600.

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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).