You say you are switching from Baquacil to salt. You do realize that salt systems are just a METHOD of feeding chlorine into a pool?

If you continue with the switch, you'll need to go from Baquacil to manual chlorine and clean up your pool and filter. THEN (not before) you can switch to a SWCG.

Do NOT get the IC20! SWCG life is a function of cell 'on-time'. An IC-20 will last half as long as an IC-40, but an IC-40 does not cost 2x as much. Get a timer if you need to turn down the feed rate more than 80%.