Richard, indulge me please.
So let's check DH calculations. Using 7 oz pucks in 27038 gallon pool. He figured 15 pucks.
Using your formula, I get 2.789724515 ppm/lb in 27038 gal pool and therefore need 3.5845833333333 pounds of pucks to get a 10ppm increase.
Which means 8.19 pucks.
Don't want to put you in the middle but......................
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