Tom Kirshbaum

Thanks, Chem Geek. Your answers are as crystal clear and the best water! Now, after repeated oxidizing or shocking, when does that original bank get exhausted and require some more doses of the powder? Tom

I've been trying bromine, following Water Bear's three-step process. Each day or two, whether I use the tub or not, the bromine reading (yes, I'm using test strips) drops to hardly any color change on the strip, so I add 1.75 tsp of non-chlorine shock (215 gal. tub) and the bromine level goes back up to normal. But to get this I have to shock every day. Is this because my floater isn't open enough? If the shock takes the bromine level back up, doesn't that mean that there's enough bromine in the water? If so, won't opening the floater more cause bromine levels that are too high when Ii do shock? As you can see, I'm confused Tom

I understand the function of CYA is to keep chlorine from disappearing in sunlight. But what about an indoor spa in a room with very little natural light and which is generally opened only at night? Why does such a pool need any CYA at all? Follow up: if CYA isn't needed, why bother with the dichlor in the dichlor/bleach method? Why not just use enough bleach to get the CH up to the right level and forget the dichlor?