Hello - We bought a home that had a closed inground pool for 2 years. The pool is open now and is clear and clean. However, it seems like it will not hold Chlorine? We have a chlorinator - which have been told by servicing people it will not hold a level until there is a consistnt level to hold. We have shocked it numerous times, and haven't shut the pump off at all. I thought it was supposed to always run? Anyway - the chlorinator has had tablets in it for 3 weeks, when they first opened the pool the they connected it for previous owner bypassed it, a week later we noticed this and put it on high, have shocked it with 2 cases, then a case and a half since, and the readings on chlorine are still virtually zero. The pool itself is open and ready - but what do I do about chlorine?