We've had a lot of rain this Spring so I have fought cloudy water for awhile. Water is clean just a little cloudy. Was taking samples to pool store weekly and following their advice, as well as buying what I was told I needed. Never completely cleared up but was real close until.... Went on vacation, stayed a little longer than planned on staying after we got there. Had a boy coming buy to check on things and water everything, I had left him some shock to put in the pool before we got home so hopefully we would return to even prettier water than we had at the beach. To our horror we came home to a dark green swamp!!! Took samples to pool store, my last trip to a pool store hopefully. My better half found some videos online so we decided to give it a go ourselves. We do not have a test kit yet, ordered a Taylor 2006. Currently just using 6 way test strips. I have fought the green since Tuesday with little improvement. First off added cynuric acid to raise the level up from 11, then started adding bleach, as well as a bottle of algaecide, muriatic acid trying to balance everything and get the fc to a level to start fighting the algae. Since Tuesady evening I have added GLB supersonic, clear view granular chlorinating concentrate, and 22 gals of bleach. Test strip shows total chlorine very high, fc off the color chart high, stabilizer good, ph a color that doesn't even register. Sand in filter doesn't show channeling, so I have flushed it only not replaced. I have brushed the sides and bottom often, vacuumed not that I could see, back washed 5-6 times a day. It's not as dark a green, slight brown tint to it now. But still not clearing, scum on top in the mornings not as bad. Not sure what to do.... Drain and start over????