What Carl said + . . .

1. SWCG systems are probably the easiest, especially if you can't check your pool ever other day. There's no clear-cut 'best' SWCG, but the Goldline (Hayward) and AutoPilot systems seem to be somewhat better than the others. Regardless, purchase the biggest unit you can -- and run it fewer hours. SWCG life is a direct function of "ON" time, and none of the systems seem to last as long as the sales literature suggests.

BUT . . . you must have salt-compatible construction: brass ladder anchors (not zinc), cupro-nickel exchanger on your heater (if any), etc.

2. Paramount systems introduce tremendous flow-restrictions into your piping, and require over-sized, energy wasting pumps. Instead, purchase a Polaris 180 or 360, with a dedicated pump. That system works effectively, requires no special pump, and only 1 extra line to the pool (for most pools), and only runs when you need it.