When we renovated my pond we used a Mitsu motored pump until it tipped on it's side one day and burned up the motor due to oil starvation. Beating a dead horse here, but the Hondas have low oil shut-offs.

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[Linked Image from lh6.ggpht.com]
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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).