Not to sound like a sales pitch, but it is a product that answers her question on salt systems.

You may want to consider our newest offering from AutoPilot.
It's a low salt Chlorine Generator, that should set your mind at ease on the salt issue.
www.autopilot.com AG unit. Designed specifically for above ground pools, and to operate at 1000 ppm.

Having said that, Evan and Janet are correct, a properly maintained pool will not have the effects that you're looking to get as a result of adding a chlorine generator. With a salt system, you can still have those effects if you don't maintain your pool properly!

How frequently are you adding chlorine/chemicals? Weekly, as most people do? Perhaps adding smaller dosage, more frequently, will help with the high chlorine swings.

However, it all starts out with making sure your water chemistry is balanced and properly maintained....key word being maintained.