Wow, thanks for all the help guys!

Alright, as I said I was going to do, I added 1/2 teaspoon of bleach to a gallon of pool water last night at 7:00. This morning at 5:45 my chlorine reading was a little high in the bucket. I have a cheap kit, and am going to buy a Taylor, but it looks like about higher than 3.0 as my kit tops out at 3.o and it was darker than that.

To answer PoolDocs questions:

2. Never heard of those brands and haven't used anything this year other than algaecide, chlorine and pH UP.
3. I think I may have used some stabilizer last year, but I keep bad records. I remember putting in some stuff that the pool store wanted me to that took a long time to dissolve and sat on the botton of the pool. Maybe that was it? But I didn't do it at the end of the season as far as I can remember.
4. Never heard of Baqua Shock.

So what now everyone? Should I just do the calculations and buy the bleach? My pool is 24000 gallons.

Thanks again!

Bill