Hi yawl..I'm Connie here in Shreveport, La. My pool is very green. I keep buying the recommended chemicals that store is selling me but it is not clearing my pool Up 3 bags of shock and a gallon of something else the next day the poll ends up really cloudy you can't see past the second step on the ladder can someone please tell me what I need to put in my pool to get clear water the pool is 18000 gallons of water thank you so much all I appreciate you.