approx 8 gal of Ultra (6%) or 9 gal of regular(5.25%) will raise your 32k pool from 0 to 15 ppm. each gallon of Ultra will raise your pool just under 2 ppm (1.9 ppm) and each gallon of regular will raise it just over 1.5 ppm (1.6 ppm). I would use the rounded off numbers to make it easier, close enough for government work!