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Title: Broken out of the box
Review: Put the pump (brand new out of the box) in a refilled/clean pond with everything perfectly clean. Worked for about an hour before it started stuttering. Sounded like air or something was caught in the impeller, but its perfectly clean, the pump is submerged completely. Pulled off the impeller to see if anything was caught, but it was perfectly clean. The Danner Mfg website is of no help. Also for the 1 hour or so it did work, the output was much less than expected (barely more than my 300gph we were replacing). All in all I'm quite disappointed.
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