"Phyllis and Jim Hurley" wrote:
Our pump went out after 7 years. Time to find a replacement. Our system
holds 3900 gal. The main pond 2900 ...

I'm so glad you asked this question -- sorry to hear about your pump though.
Our 8 yo Little Giant submersible pump recently quit as well (ran it
24/7/265 for most of that time). We're thinking about doing some replumbing
to add a bottom drain, skimmer, and maybe using a nonsubmersible pump. We
have a month or two to mull over, design and rework. Any recommendations are
appreciated.
--
Zookeeper
Oregon, USDA Zone 7
3500gal pond, 13 pond piggies