First of all we are only discussing “Exchangeable” Aluminum. Not “ALL” aluminum is exchangeable and doesn’t even count. A low concentration of exchangeable Aluminum is 5 parts per million. A very high concentration is 250 parts per MILLION. Not 5%... So if he claims ten times more this is still only 50 PARTS PER MILLION. Not “pounds per ton”.
Yeah - I commented on this REPEATEDLY already - starting with POST #2!!
I promise you you do NOT know more than I do about this. I have a PhD in physical chemistry and maintain a small personal farm.
Don’t go all Dunning-Kruger because you have Google.