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12,500 gallons => 9.6 PF
10% shock => approx 0.8 lbs chlorine (gas equivalent)
0.8 x 9.6 = 7.7 ppm
By the way, "shock" is not a thing, just an action. "Shocking" just means adding more chlorine than usual . . . and there's no magic number.
Well, there is, but it's not a SINGLE number.
Rather you should maintain your chlorine level at 5% of whatever your stabilizer level is. So, if CYA=30 ppm, then FC should be 1.5 ppm AND if CYA= 80 ppm, then FC should be 4 ppm
"Shocking" -- as an action, rather than a chemical -- will help kill off algae and slime that may be getting started in corners, etc. In CLEAR water, with no problems, a weekly dose of 15% of CYA is a good idea (5 ppm if CYA=30; 12 ppm if CYA = 80).
AND . . . if you add it in the evening, you'll get much more 'bang for your buck'.
PS. At many Walmart stores you can buy 10% "Pool Essentials Chlorinating Liquid" for $3.27. And it's probably fresher than what the pool store has!
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