I have 25000 IG vinyl pool. I usually shock with bleach but have some cal-hypo on hand, but I don't know how much I should use? I put in 3 lbs. last night and this morning I have .5 FC. So I obviously needed to shock pretty bad! Just don't know if I put in enough? I added 3 more lbs this morning. How long after adding should I wait to test and see how much it brought it up?

My numbers this morning
FC .5
CC .5
Alk 90
PH 7.2 (it seems to be falling)
Cal 150
CYA 90

Best guess chart says shock to 20....????