Quote Originally Posted by CarlD View Post
If the pool store guy says add 5 lbs of Tot Alk increaser, DON'T DO IT! And, if you do, yes, use A&H Baking Soda. It's 100% sodium bicarb.

I NEVER add more than 1 lb of baking soda and I have nearly over 19,000 gallons, near 20k. With your pool, AT MOST add 2 lbs at a time.

You have 36,000 gallons. So the forumula is: (1,000,000/gallons_in_pool)*(Bleach concentration)*# of gallons of bleach.

So....(1,000,000/36,000) * .06 * 1 = 1.67. That means one gallon of 6% bleach will add 1.6ppm of free chlorine to your pool. (.06=6%)
If you use 12.5% then 1 gallon of it will add 3.5ppm of free chlorine to your pool
Bleach and Liquid Chlorine are the same stuff. Sometimes the pool stores sell it in 6% strength but also as "liquid shock" at 12.5% or in 5 gallon carboys as liquid chlorine, also 12.5%. That's what I use, and the guy I get it from turns it over so fast it usually tests at 14%.

Carl
I understand. The dosage is determined by the water test. The number of gallons to achieve the required dosage is based on the Chlorine percentage. Brilliant!

Thanks a million – ha ha.

Now my task is to interpret the test correctly in order to know the dosage.