I did not really want to have these threads open, DIY 2 part is a heated subject, a few people that follow it do tend to get upset when you point out their cheap or out of balance way more to the point is actually not correct and potentially damaging, as such we decided to go down a more info type of post, where people could then contact us directly should they want further info, just to stop the crazy off the wall debates that we often see.
However I thought I would try just keeping this one open see how it went, so far 90% ok
Lots of good questions and answers.
It seems I missed your question or reply which I am sorry about, but yes you are 100% right as above stated, if you can find your own pure salt, then yer for sure go for it, but not everyone wants to store such large quantities you have to buy from the producers and there is a risk of moisture getting to it, as it will soak up humidity in the air, large quantities have to be used quickly just as with small amounts.
So if this is the way you wish to go I will happily supply all day Part C to everyone that wants to do Balling right. Part C is by far not expensive, goes a long way and you know then you are doing things correctly.