Hello, I am building a new IG liner pool. Its roughly 45-48k gallon salt water pool. PB wants to do a 2hp single speed pump. I have qty of 2 1-1/2" line skimmers, Qty of 1 1-1/2" line drain, I have four returns via jets in steps, jets in swim out, and three spray jets that are right above water line. Looking at a 310 hayward filter. I would like to do either a two speed or Vs. Need opinions and options please. Thanks in advance.