I'm not sure the 12.5% chlorine I got from Menards seems as strong as the 10% from WM. Both had June dates, so I wasn't worried, but I feel like I should have had more FC a bit ago than I did after adding 40oz this morning. I lowered my CYA #'s again...I just can't tell between 60-70 and keep going back and forth. It changes my FC requirement by 4 either way. However, all of this being said, I couldn't test but once yesterday, so I will just start up again now that I have the R-0871 and see where we land.