I have a 2 speed setup for pool and spill over spa combo. Run it on high for an hour then low for 8 and back to high for another hour. The spa drains halfway down when the pumps off. High fills it quickly and moves all the surface stuff to the skimmers. I also have a SWG that works better at low speed. I'm not forcing alot of water around the SWG thru the manifold. I like the setup and works well for me. You can hardly here the pump running on low.