

Hi Kurt,
I've been involved in a lot of these and have yet to see a failure, they seem to be robust. Grundfos calls them a 20 year pump so it may be a while before we really know!
All of their charts show that no model tops 450' of total lift and that 500' is maximum submersion. I too keep hearing of 600' max lift but no charts show any data above 450.
You can go to their web site and use the WebCAPS free software to get detailed product info and performance data.
 
-jeff mo


>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative SOLutions


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