1 gallon of regular bleach (5.25%) adds exactly 5.25ppm of chlorine to 10,000 gallons.
1 gallon of Ultra bleach (6%) adds exactly 6ppm of chlorine to 10,000 gallons.
The size of your pool, and the level of CYA (stabilizer) determines how much chlorine you should use in general, and how much you should use to shock it when you have algae growing. It's called the "Best Guess CYA chart" and it's in the Using Chlorine...forum.
There's also a beginner's chemistry guide in the Testing...forum that I wrote and Watermom stuck there. These should help you understand that basics.
If you have a pool store test your water, ALWAYS ask for the results, even if you have to write them down. It's classic for them to take a reading and inevitably recommend that you add lots of chemicals, usually all at once!
The object should be to help get your pool healthy, not sell a lot of chemicals. I don't blame the clerks in the stores--they usually get their instructions from the owners, who are fed a line of buffalo chips by the chem companies...whose object is to sell lots of chemicals whether you need them or not.
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