Pool is hazy on opening and getting worse

[Idgie]

I opened my pool and the water is hazy. A test reveals low pH and high chlorine. I am wondering what happens if I accidentally backwashed the pool antifreeze into the pool?

 

[Texas Splash]

Antifreeze in the water is typically negligible. Most important is adjusting the pH back to the 7 range and balancing the FC to the CYA. You might also need to run an Overnight Chlorine Loss Test which will confirm if you have algae and need to do a SLAM Process.