I let my pool get away from me for the past 2 months. So now I have quite the battle ahead of me. My pool is Dark green, with what I call little Algae plants floating in it. So where do I start?
I have a round 8500 gallon above ground pool with Vinyl liner (Not Intex type)

Here are my readings as of right now

Chlorine - 0
PH - off the chart on the high side. (Took 25 drops of the acid demand test to get it to read normal)
CYA - 85

I know last year I had luck with shock levels of around 25. But with algae being so bad right now, do I take it higher? How high can I take it without damaging the liner?

Thanks

Tim