We're going to be buying a pool at the end of the season. I've been quoted a package for an 18' round Aqua Leader Blues pool. The package includes a 1.5 HP Hayward. This is our first pool, and judging by what I've read on this forum and other places, this seems to be too big. Am I correct? If so, what size is proper for an 18 round? We're also going to do a SWCG.