[QUOTE=PoolDoc;75989]I tested using MPS (potassium monopersulfate, Oxone) in various non-chlorine shocks, and got NO improvement. #3 - Chlorinating with single doses of calcium hypochlorite, added at closing, in a very specific manner definitely helps.
I think I mentioned before that this approach took an overloaded and under-filtered Boys' Club pool with 300+ boys / day from hazy murky to crystal clear on Monday, and clear throughout the week. This is perfectly safe . . . IF you follow my instructions . . . but I don't usually explain this until somebody promises that they will dot their i's and cross their t's just like I say. And, of course you have to be able to purchase granular cal hypo, and have a location where you can add it AHEAD of the filter. (Skimmer, gutter, or surge pit)

Thanks!
I promise to dot my i's and cross my t's just like you say with calcium hypochlorite if you will instruct me....

I was about to buy a bunch of MPS (Wipe-Out is the brand at our supplier). Thanks- I won't.