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I am now subscribed. :)
So good news and bad news... Got the Alkalinity down. I don't have the numbers in front of me, but its around 120. However... PH dropped quickly, I should have tested every day, but didn't. Its down to 6.6. First and foremost, is that safe to swim in? I read your other post about Borax. I have added 6 cups of borax (10,000 gallon pool, 1 dose) last night. I will be checking today to see how the pool adjusted.
Intex 22' x 52" Round Above Ground Pool - 2500 GPH Cartridge Filter
10,000 gallons - PF=12
A pH of 6.6 isn't unsafe . . . but the problem is, it may not be "6.6", either. Probably, that's just as low as your kit or strip goes, so an actual "6.6" or an actual "4.6" would still READ 6.6!
Don't swim till your pH is ABOVE the lowest value your kit can detect.
Are the stains gone? What is your stabilizer level? What is your calcium level?
(Thanks for the subscription!)
Can you help me understand where you got 12 cups? I used the link below and I came up with 6. I believe you of course, but just want to understand. 😊
http://www.poolforum.com/pf2/showthread.php/17055
"PF=12" is more a note to me. It means that your pool is 1/12 of a million pound pool, or that 1 pound of stabilizer (or chlorine gas) will add 12 ppm of stabilizer (or chlorine).
PF (Pool Factor) offers a quick way of calculating doses:
PF x pounds added x % concentration = PPM added.
So, in the case of 1# of dichlor (55% chlorine; 50% stabilizer), the calc is:
12 x 1 x .55 = ~7 ppm added (6.6) for chlorine and 12 x 1 x .50 = 6 ppm stabilizer. (I know the percents don't add up: but chlorine percents are reported compared to chlorine gas, which is 100% chlorine gas, but when hydrolyzed is ~50% HCl and ~50% HOCl. HCl is muratic acid; HOCl is chlorine in the pool or sanitizing sense.)