PF stands for "Pool Factor" which is a calculation that Pooldoc uses to estimate effects on water with given amounts of chemicals. Here is something I copied and pasted from another post Ben wrote that may help you better understand how it works:
PF = pool factor.
If you add 1 lb of chlorine gas to a pool with a PF of 1 (120,000 gallons = 1,000,000 lbs) you get 1 ppm of chlorine.
If you add 1 lb of chlorine gas (100% chlorine) to a pool with a PF of 10, you get 10 ppm of chlorine.
If you add 1 lb of dichlor (55% chlorine) to a pool with a PF of 10, you get a 5.5 ppm of chlorine (1 x 10 x 0.55)
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