Thanks amigo, that's kind of you to say and makes my day. I owe the forum a debt of gratitude and try to pay it back whenever I can. I've received so much direction from the forum vets, some of whom aren't even living now, I know I'll never come close to repaying.
Gypsum works in the same manner as alum, and while I believe it will take more to achieve similar results, it's also safer [no PH sag] and may be more accessible or affordable.
Looking ahead...in 2-4 weeks if there is no settling in the jars we will conclude ionic imbalance. Rex Rains makes a living performing alum treatments [we worked on a project together at my place] and he's a great resource. He can source alum/lime cheap and is good applicator.