While researching variable speed pump options, I'm reading a lot about sizing the pump with spa and pool in mind. My pool, built about a decade ago has a separate pump for the spa outlets. It kicks in when I turn the spa on but otherwise sits idle.
Now that VSPs are common, is it standard pool design to have both the spa and pool on the single pump and to have the pump switch to high rpms for spa mode? Is this the reason to go with more powerful 3hp pumps?