Dave - A submerged pump will run cooler, quieter and more efficiently. Regardless of what type (submerged or not), hook it to a GFI and give the GFI a semi-annual inspection and reset test to be on the safe side.
12 ac pond in NW Missouri. 28' max depth at full pool. Fish Present: LMB, BG, RES, YP, CC, WB, HSB, WE, BCP, WCP, GSH.
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