I'm very late getting the pool going this season ( I had some plumbing issues). It was a green swamp. I have just shocked it hard and have continued to shock it daily. After a week it still isn't quite clear, but much better, and yes greenish. Haven't had any problems with hair or nails from the pool. I have ordered a test kit from Amazon and will check everything as soon as it gets here, but from my simple test kit I know the PH is 6.8 or lower, so I'm going to add Borax tonight.

The pool company had me add 16 lbs of baking soda before starting the shock treatment.