Funny , because HotSprings has a Saltwater SWG system built into some of their tubs . Cant see them voiding a warranty on only some of their tubs due to salt water , when other ones have it from the factory .
Hot Springs "Freshwater Salt System"
If at all possible, go with a Saltron Mini . It will be the best , easiest way to maintain FC in your hot tub . The salt content is so minimal , you really cant tell its a salt tub. We have had people over that are shocked when I tell them its a saltwater tub .
We have had a Saltron Mini on our brand new Strong hot tub since day one, with no ill effects . It - Just - Works !
It is so consisitant when you get the setting dialed in, that I literally forget to check the FC for a while . It keeps it rock solid .
After trying MANY different hot tub sanitation types over the years of owning hot tubs , the Saltron Mini is the easiest way to get perfect stabile FC results for a hot tub.
We have a SWCG in our pool AND hot tub now for that reason . We would NEVER go back .