I've owned several Skimmers through the years and I'm very happy with my current choice due to the high performance, low wattage and value they provide. For the 144 half circle I run an SWC 160 and for my 600 I run an SWC 300, both are powered by Sicce PSK-2500 pumps, but the 300 has two pumps and the 160 has one. These Skimmers do an awesome job and the only thing I do is empty the cup every other week or so. You can get more info at WWW.swcskimmers.com