Speaking of training Dr. Weil's field of expertise is in Integrative Medicine with some secondary knowledge of community health (which doesn't really cover water treatment more than passing mention).

So I really wouldn't give his opinion about pools any more weight than I'd give anyone else's with a good college education who did some research while putting in their own pool.

If I were looking for definitive water treatment information I'd look for a publication by a Ph.D. in Environmental Engineering with a subspecialty in Water. Those are hard to find so I have to listen to you guys!! LOL
Jo