Hello I am having a heck of of time with my pool. I have a IG 22,000 gallon pool with a Sand filter and a vinyl liner. I do not have current numbers on the pool. when I have them tested on Monday I was told everything was good except my chlorine was low. I will try and get number to post tonight. I opened my pool over a month ago and everything in the pool was fine all chemicals and color up until this past Saturday. I have a solar cover and took that off and the pool was a very very dark green. You cannot see more than a inch into the pool. I took a water sample to the pool store and had it tested. All my chemicals were down now. I added 10 pounds of PH and 3 bags of shock as instructed. Next day the same color. Took another sample to store and they gave me another 8 pounds of PH and 5 pounds of Alkalinity and 3 more bags of shock. The next day same color and went back to pool store and was told to put in 8 pounds of shock and keep running the filter like I had been. Next morning no change. Now I was told to put in 10 Gallons of liquid chlorine and a bottom of black algae killer. I also brushed down the pool. This morning still exactly the same. Anyone have any ideas??? This has already cost me $200 and I really don't want to keep throwing money and chemicals at this thing with no change.