The green monster

What is your TA and pH?
If you are using the Poolmath app, be sure to share your data so we can see it.
 
His last post he said his TA was 40.... if you add 11lbs that will put you near 100 which is too high and you will see your pH rise too much.

I would not add 11 lbs... maybe 5 lbs and recheck next day (if your TA is 40)...
 
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