I bought a house with an 18' x54" above ground round pool. It was empty. We put in new liner and filled with city water. Didn't know about the forum yet, so went to Leslie's Pool Supply and bought a few hundred dollars worth of chemicals. Added them according to directions. All test strip readings are fine except the chlorine. I can't get a chlorine reading. At this point, I have added an entire 1lb bag of chlor brite. I have not put any of the chlorine tablets in yet. What would you recommend?