I have a 17,000 gallon pool with an older single speed 3/4hp pump on 115V.
I would like to improve my household efficiency, but all the VS pumps require 230V and can't run on the existing 115V.
I wondered is it made any sense to add a second pump rather than replace the existing with a variable speed or 2 speed.
There are lots of options for small 15gpm self-priming magnetic drive pumps with 1 inch I/O, with very high efficiencies.
If I added a bypass and used the existing pump for vacuuming only - I could upgrade relatively inexpensively compared to adding a new 2 pole 230V and running conduit outside...