For high blood pressure patients, is no salt a correct substitute for salt? Also, what is no salt?

OK. First be sure you are salt-sensitive--if you eat a regular diet for a week and monitor your bp, then do your best to have a no salt week (it will seem longer, yes) also following your BP -- if you are fortunate to not see any change, then you are not "salt sensitive, " so no change is required. If need, "no-salt" is a potassium based salt that has no sodium. Reasonable use is ok.