I am having the same problem. "Chlorine lock". I googled and it braught me here. Don't mean to jump in but need to know how much bleach to use. Posted #s last night but didn't show.Pool is 21000 ig vinyl.
Off memory think they are
Fc .2
Ph 7
Alk 130
Calc 400
Cya 94
These are pool store #. I need to get a kit.
Any help is appreciated. Water is clear for now. Been shocking with all kinds. Usinf algea 60. No metals present.
Thanks , chris