20 pounds?????What, do you have a 100,000 gallon pool????
Jeez, those guys! The difference between 1 lb of pool store alkalinity raiser and 1 lb of baking soda is several dollars. That's IT. Both are sodium bicarbonate--the same stuff, only it's catastrophically more expensive at the pool store.
Normally, start with 1 pound--not 20! Add it to the skimmer while it's running and wait a day, then test your Total Alkalinity. You are aiming for 80-125ppm of Tot Alk. Just add 1 pound of baking soda a day until you reach your target.
That's all you gotta do.
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