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Last year, I had an issue maintaining Free Chlorine. :(My Pool Guy said, I should just empty the pool and add fresh water. I opened the pool yesterday only to find a layer of green algae covering the bottom. Also, Zero FC. I added 2 lbs of Clorax Pool Shock. Water is still green and now cloudy...

Since I opened the pool in June/2014 (13,000 gallons above ground) Test results have showed No Free Chlorine. For last 4 years have used BioGuard products and never had this happen. Pool place told me to add 28lbs (over $100) Super Shock or drain water and start over. Water was clear & good for...