So I stocked up on WM bleach in the last few weeks, but then I found 5 large jugs I guess I got last year in the garage where my wife kindly put them in a cabinet. So After doing Liquid Chlorine 12.5% to open I switched to the 6%, I don't seem to be seeing the chlorine increase as much as I did last year. Does unopened bleach if stored in a cool garage lose it potency over 8 months? I am adjusting through it, but figured I'd ask. I am confident I can test and adjust as needed. I think once I use all the bleach I may move to 12.5% from pool store, I figure it costs me 25 cents more a day since I use 1/2 as much and the price I get it with a discount for buying 4. MY 3 local WM's get cleaned out of the big bottles this time of year and I have mixed feelings on Dollar store stuff and the strength of it being consistent, ironically that is what I am asking about.
Also, how long after adding chemicals can one test in a 12,000 gallon pool? 2 hours? I've seen different specs for my pool from 10,500 to 12,000 gallons, so recently I've been estimating at 12,000 gallons.