Merrick

HI All, I have been trying to get our pool going for several weeks now, and I simply have not been able to get it right. It is still kind of green and cloudy. The numbers on my test kit seem to be right, with the exception of the Chlorine. I don't know if the algae is eating it off or what, but the last time I put any shock in I put in 3 bags (our pool is approx 13,000gal), when I tested it a few hours later and then again early the next morning I did not get any readings for Chlorine (free or otherwise) on either test. The rest of the numbers are as follows: pH: 7.2 TA: 120 CYA: 40 Please let me know if you have any recommendations, I have never had this much trouble getting the pool started. Thanks in advance. All the Best, Merrick