Hi folks. New to the pool world here. Live in Denison, TX, about an hour north of Dallas. Bought an Intex 18x48 w. saltwater system a few weeks ago, set it up and loved it. Today I upgraded to an Intex sand filter and pump. So here's the deal. The pump works for about 2 hours, then shuts off and is very hot. Any ideas what I'm doing wrong?