My BP has gone down since I dumped the processed carbs and upped the Celtic Sea Salt. So much so that I have also been able to dump the BP tablets. I tended to eat fairly low salt before that but now consume at least a teaspoonful a day. I can control it well because I rarely, if ever, eat any other salt from any other source.
I don't know what kind of salt is used in the electrolyte solutions but I wouldn't mind betting it is pure sodium chloride without all the other elements that help to balance it in the body. I know it usually has potassium and a few other minerals, but real - complete salt has over 84 different minerals and trace elements and they all work to buffer the sodium chloride and help the body use it properly.
I wonder how our ancient ancestors got on when they didn't have the 'benefit' of Government and Medical guidelines! I think they probably learned from experience. That experience got the Human race this far, so they couldn't have been that far wrong, could they.....
The salt gets blamed - but - and it's a big but - what if it is something else that is driving the blood pressure issue, and the salt just exacerbates it because the body chemistry is so out of whack? My BP went down when the commercially-made processed foods, the sugar, the white flour products, the processed meats, etc. - anything I hadn't made myself basically - and knew what was in it, went, and the salt hasn't affected it since at all.