

Copper causes stains and can cause blonds to get greenish hair. They also contain copper which you do *not* want to add to your pool. Clears cloudy water and removes swimmer contaminants (body oils, sweat.

You've not done any harm with one time use but I will caution you though to avoid ANY product, particularly those made by Clorox, that have the XtraBlue label on them. Clorox Pool&Spa 33506CLX Pool Shock XtraBlue (6 1-lb Bags), 6 Pack, White 5,397 32 offers from 40.00 Clorox Pool&Spa Shock XtraBlue 1 lb 6,119 31 offers from 11.02 Clorox Pool&Spa 33512CLX Pool Shock XtraBlue (12 1-lb Bags), 12 Pack, White 3,720 18 offers from 82. 6 in 1 Formula: Kills and controls green, black and mustard algae. SWGs work s-l-o-w-l-y, kinda like the hare and the rabbit. Remember that a SWG will work best at maintaining a FC level that you've brought up first with liquid chlorine, but it takes too long for it to produce all the chlorine you need starting at zero FC before algae might take off.

While the SWG doesn't work in winter (too cold water) I always use plain, unscented, non-thickened, non-Clorox brand household bleach when I need to raise my FC.
