Thanks for reply, I used a 78% calhydroclor. I test w/5 hth liq test kitWhelp ... that is your problem.
Pool store testing and advice is horrendous.
If you want to take control of your pool, you need to invest in one of the Recommended Test Kits and after checking all the levels, follow the ShockLevelAndMAINTAIN Process to clean up your pool.
What "shock" did you use as that will clue us in to the condition of your water.
We hear variation of this over and over again ... it "works" {you get lucky} until it doesn't.I've been doing this for 18 years at least never ran into this.