I finally bought an above ground pool. I work at a pool store which is why I got a great deal on a pump and filter. The pool is only 15' round and the pump is a 1.5 hp for above ground pools. It's connected to the pool by 2-1.5" hoses 6 ft long each. Basically the pump is just too strong, and I'm wondering what is the best way to reduce the gpm.? So far I've considering putting a ball valve at the outlet of the filter to adjust flow or downsizing the impeller to a 1 hp. What do you think? Thanks for any help.