Quote Originally Posted by wilbur14 View Post
circulators are these devices that screw into your returns and go round and and sweep the return water across the bottom and sides of the pool. keeps the dirt off the floor and sides.
Without photos or catalog info, I can't be 100% sure, but most devices like that generate a huge amount of back pressure, and waste a lot of your circulation. (For reference: in-floor pressure side pool cleaning systems are HUGE energy wasters!)