Hmmm. Interesting thought. If you are double lucky, see if anyone shoots AquaBright in your area. I'd bet, if they did it during a pool job, that they could shoot AquaBright on it. And that would stop it for many years. I assume the rust is near the water line?
But if if lots of things are rusting, you have another problem. Maybe very low PH? Or, more likely, an inferior grade of stainless steel. All stainless steel rusts, but the corrosion resistant stuff is light years better than the low cost stuff. My guess is, no matter what you do with your water, your rust problem will remain. Can you replace the things that are rusting with more corrosion resistant stainless?
For example, I had a grill made from 303 stainless. It became deeply and heavily pitted with rust, and parts of it rusted through. I replaced it with a grill that was made from 304. This new grill is as shiny as the day it was new, same use, same environment, better stainless steel, no rust.