Chlorine level is probably good -- it's in the 15 - 30 ppm range.

+ Lower your pH level to around 7.4. (Muriatic acid page linked in my signature!)

+ Get a good test kit! In particular, we need to know your stabilizer level.

+ Here are links to the kits we recommend:
HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
+ Send a picture of your POOL. Sometimes the color tells us what the problem is.