Concentrating Isopropyl alchohol using non-iodized salt I am using 99% isopropyl alchohol to clean soldering flux residues for my electronics projects. Due to a certain viruse running amok in the world today, I am not able to get from my usual supplier. I am running low on supplies. So i got this idea that i would concentrate the more common (but still not so easy to get in my area) 40% or 70% ispropyl alchohol. 

Searching the internet on guides to do it, it would seem that there is an easy way to do it. According to this instructables; add non-iodized salt to the solution until its past its saturation point. By this time the heavier water should sink and the lighter isopropyl should float. Extracting it would now be easy with a syringe.

For my question. Water and especially salt is an enemy to any metal. I would like to ask if this process mixes tiny amount of salt to the isopropyl? if so by how much %? Is NaCl even soluble to isopropyl or are these just tiny particles floating around and if i leave the solution to settle for a longer period of time those particles would sink down. up until what percent can i bring the concentration to?

As for the Salt to use what other ingredients should i look out other than iodine( or other close sounding).

P.S. I am no chemist any way, the only chemistry background i have is during my high-school days. It was a time that i was still not able to appreciate class lessons. So go easy on me
Common table salt can have additives, so I would recommend working with high purity Epsom Salts (magnesium sulfate hydrate). Heat to remove water of crystallization at 100 degrees Celsius for two hours.

Add your isopropyl alcohol with the MgSO4 in excess and wait until there is a separation. I would decant and allow for a safety margin above the visible separation line.

Here is a reference.