Yeah, full numbers will help.

I suspect your pH was far lower than 6.8, dangerously low. I'm worried for your liner.

Post the T/A. If it's low or not too high you can use Soda Ash to raise your pH, because it will raise your T/A as well

Soda Ash is sold as pH Up! and other expensive junk in pool stores, but it's sold in grocery stores as Arm & Hammer Washing Soda--usually right next to the 20 Mule Team Borax. It's a yellow box, not orange like the baking soda. Washing Soda is the same stuff as the pool store soda ash, only per pound it's even cheaper than Borax!

In fact, if you cannot get Borax, you'll have no other choice but Soda Ash--and the Washing Soda should be relatively easy to get.

Look at the bright side! With all this Borax you'll get your borates level up and that's a good algae inhibitor.