On Wednesday I opened my 20,000g inground pool for the season and in the beginning after removing the pool cover, it was green then I added shock and algaecide, then the pool cleared up but is now cloudy. My free chlorine level consistently stays low and I've added a total of 8 gallons of shock since Thursday. I use a test strip and all of the readings are good within normal range except for the free chlorine level. Even after shocking the pool, by the next morning when I test the water the free chlorine level would be low again. The stabilizer level is ideal. I have brushed the walls and floors of the pool and has been running the filter since Wednesday. I have a cartridge filter and clean it every day since Wednesday of opening the pool. I bought the cartridge last summer and there are no rips or anything still in good condition. . I am confused as to why my pool is still cloudy? Am I not adding enough shock? Or am I suppose to be a little more patient as the cloudiness takes time to disappear? Today is Monday already and I'm not sure what to do next hoping to not have to spend an arm and a leg to fix this problem. Please help!!!