Wanted to add my welcome to the forum!!

One of the reasons you don't have a chlorine reading is because you have no stabilizer in the water, which protects your chlorine from the sun. So for now, the sun is partially the problem. Another part of the problem is probably stuff the pool store sold you that's eating up the chlorine you're putting in. Watermom is right, as usual--if you will test with a drop-based kit, or have the pool store test for you and come post your results here, along with the ingredients of whatever you've added to the pool,(not just "shock", but the actual ingredient) we can help you get it clear and easy to maintain.

Janet