When it comes to hot tubs, it would advisable to not to use a salt water system. Think about what salt does. The corrosive power of the salt that gets put on our road. Hot salt water in your Jacuzzi (ג׳קוזי) will do the same thing–it’s just what salt does.
The metal components of your pumps, your heater, perhaps even your jets in Jacuzzi (בריכות ספא) can be affected by corrosion caused by salt. If you’re lucky, they will still be covered under your warranty, but no one wants to waste the time with repairs and the risks of them being needed during the winter.
If you have any other extras on your hot tub, perhaps a stereo system or television, expect extra corrosion on the wires and connections with a salt water system, also. Often times, these electronic components only have one year warranties, and there is a reason for that.
There isn’t a much of different problems with these systems, but they are catastrophic problems. Why would you want to put yourself at risk of needing to completely replace hot tubs (ג׳קוזי) heaters, pumps, wiring, etc, for a system that really does, essentially, use chlorine or bromine, just like many other chemical systems. Sure, it’s salt water, but salt is sodium chloride, NaCl.