I've accidentally added a bit too much acid to my pool and brought ph down to 7.0. I've never had to add anything to increase ph before (usually it's regular addition of acid to decrease) and in reading the guides I see a little bit of conflicting (or more like confusing) information on increasing ph.

Should I be using sodium carbonate or sodium tetraborate to increase ph?

Also, I had planned to let the kids go swimming this afternoon; should I not let them swim until I've raised the ph back up?