Which size sea swirls? There are three available that I know of:
1/2" with a max flow rate of 550gph
3/4" with a max flow rate of 850 gph
1" with a max flow rate of 1150 gph
So...the pump you decide to use will depend on the size sea swirl you intend to run. Most comment I've heard about the sea swirls indicate they perform best when used with a pressure rated pump that can provide close to their max flow rate consistently.