I have a 20k gal vinyl pool with a Pentair Superflo VS pump. Looking at Circupool RJ45-45 Plus, Hayward AQR15, or Pureline PL7707. Any strong recommendations? Any insight as to when there are the best end of season prices? I would like to avoid adding a timer (I use the one built into the pump) and it sounds like there is risk on depending just on the flow switch. The pump has a 5V output. Has anyone hooked it up to a relay to power the salt water system?