My prospective pool builder has recommended a two-speed, 1hp hayward pump for my pool. He also recommended a polaris 380 as an option. Does the pump have to be running in high speed mode for the 380 to work?

Does anyone have an opinion as to which option will use the least power?

1) Polaris 380 running off the 1hp pump (pump has to run anyway right)

2) Other automatic cleaner like the Dolphin that does not need the pump running

This pool will only have two users 95% of the time it's in use. Not a heavy bather load. I was hoping to be able to run the pump on the low speed at least part of the time.

Thanks.