Quote Originally Posted by mwsmith2
I wouldn't fall too much for the "additional filter" ploy. Sure it helps, but nothing filters/circulates like the built-in equipment.

Michael
Still, the Dolphin is moving and filtering water at all depths; not just the surface. It can also do a better job of circulating chemicals and evening out the water temperature. And I'd rather clean out its filter bag than have to clean the pool's cartridge filter. It's also a lot cheaper to operate, I'd think.