To add to Mark's points. As a rough rule-of-thumb, IG pumps are usually rated in "full-rated" HP, but AG pumps are usually rated in "Up-rated" HP. I crudely figure an up-rated 1hp pump has, at most 2/3 the power and flow of a 1hp full-rated pump. That's really, really crude. From a pumping POV, 8k isn't a big pool. I run a 20K pool with a 1hp 2speed IG (full-rated) pump and pretty much run all the time at low speed--at most 1/3 HP, probably less, including my solar panels.