OK, You'll need to know how many gallons your pool holds. You'll need the area of the pool times the 4.5' to give you the pools volume in cubic feet. Then multiply by 7.48 to get the gallons.

You'll want to add 3 gallons of regular bleach per 10,000 gallons. So if you have 13,000-13,500 gallons, you'll need 4 gallons of bleach. If you have 16,500 to 17,000 gallons you'll need 5 gallons of bleach. And so on.

Then you'll need to test your water two to 3 times a day to make sure your FREE Chlorine (which is now zero...Free Chlorine plus Combined Chlorine = Total Chlorine--and your TC is zero) is between 10 and 15 or 16 (don't worry if it's not exact). If it's below 10 you'll need to add more bleach. Every gallon of regular bleach will add a little more than 5ppm to 10,000 gallons--figure accordingly.

You'll need a lot of bleach, though.