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I use 4 chemicals in our tub. No 1 is muriatic acid to bring the ph down. My well water starts at a TA of 400ppm, so I'm adding about 26 ounces of acid to reach the ph goal of 7.5.No 2 is stabilizer, which adds cyanuric acid (CYA) to the water. I use 2 ounces to get the CYA up to 30-40ppm. I put the granules in a cotton sock and throw in the tub, as these dont dissolve for a day or two. You can also use dichlor to get the right amount of CYA in your water.No 3 is boric acid. Not needed, but it seems to make the water sparkle. 16 ounces of this, get it at dudadiesel.com. No 4 is chlorox bleach. Add enough to keep your Free Chlorine levels above zero. As you become familiar with your tub, you'll get it soon enough. That's all I use, and it works great. Check out this website, http://www.troublefreepool.com/calc.html. Look at the bottom of the page, affects of adding chemicals. This will tell you, if I add this, then this will be the result. Good Luck