Oh boy!

My testing technique was completely wrong. All my chlorine results have been massively overstated. As of this morning I have about 0.6ppm FC, and 2 gallons of 12.5% left. The pool store doesn't open until 10 .

pH is 7.4, and I've got 100ppm Total Alkalinity. Is it worth adding CYA at this point to stabilize the bleach and avoid too much UV breakdown? There's none in there at the moment - levels were <30ppm when tested Friday, and I haven't added any.

Also, before discovering this site, my local pool store sold me some "Turbo Shock" powder which is 78% Calcium Hypochlorite. 5lbs was $25, but it did make a (color) difference quickly. This may be a sacrilegious question here, but would that sort of concentration help me any as a kick-start to getting my FC levels up?

Thanks,
Mark