Hi, Anna,

I think you should add just the acid for now. Sooner rather than later. That'll get your pH in line.

Yes, get your CYA tested at the pool store and post back as soon as you can.

It wouldn't hurt to put the Cl in there now but the most effective dosage will be after we know your CYA.

If it's gonna' be days before you get your CYA results, go ahead and put the Cl in anyway....you need some preventative sanitizer.