Hello, TFP peeps! Long time lurker here with a question regarding chlorine math!
I did try to find the answer by continuing to lurk but the particulars are very specific and I struggled with search terms which would successfully extract this content from every other post on the forum.
Let's arbitrarily take a 20,000 gal pool. Measuring in "parts per million," we get:
20,000 / 1,000,000 = 0.2 gal = 25.6 oz = 1 ppm.
So "1 ppm" of "anything" in this pool is 0.2 gal (25.6 oz) of that substance.
Logic would then suggest, to raise the chlorine content of this hypothetical pool from "x" ppm to "x+1" ppm, I need 25.6 oz of chlorine. The pool calculator sort of agrees, but that's where the subject line confuses me - 6% vs. 12% vs. 100% chlorine. Unless... when we say "+1 ppm of chlorine" we actually mean "+1 ppm of [12%] chlorine (plus 1 ppm of 88% more water... )"?
Pool calculator says:
To go from X to X+1 ppm FC, add 41 oz of 6% "bleach" or 21 oz of 12%.
(somewhere around 9.7% bleach will give me the 25.6 oz mathematical target)
So I guess that's my question - when we say "ppm chlorine" in relation to FC, it would seem we actually mean "ppm [~12%] chlorine"?
True / False?