We need help! We have been fighting our pool & spending way too much money at the pool store. We have been able to swim a couple of weeks & the water was crystal clear & balanced. Last Thursday the pool started turning green. We added 4 bags of shock but it didn't change. The pool store did a chlorine demand test & said we had a problem. We added 7 bags of shock which they said broke the chlorine demand. These were the numbers then (Sat 8/13) CYA-25, TC-0, FC-0, PH-7.7, TA-118, Hardness 317. They told us to add 2lbs of PH Down, 2lbs of Stabilizer & 5 bags of shock. We added all of that late Sat & Sat evening. Still no change. The numbers today are CYA-47, TC-2, FC-2, PH-7.6, TA-115, Hardness 308. They did a phosphate test today & says it is 500. I think I set the signature correctly but just in case...pool is 24' round above ground pool, 14,000 gallons, vinyl liner & sand filter. We changed the sand in the filter at the beginning of the summer. Any suggestions would really be appreciated. We have to stop breaking the bank