About a week ago my pool went from sparkling clear blue to cloudy blue and eventually poison green swamp water. After much consternation I determined that unattended PH and high CYA were my culprits. On Sunday I released approximately 2/5 of my water from my 20' above ground and refilled. I also changed the sand in my filter, and dumped 4# of Power Powder Plus in to superchlorinate. My pool went from poison green to a lighter green but still super cloudy. I have been using the Total Poolcare DPD test kit from a well known chain store, as I figured it was more accurate than the ole 6 way test strips. My most recent test this afternoon shows CYA at 40, PH at 7.5, FC >5 (5 is max on this block) TC >5. I can't accurately calculate CC because I don't know what the exact ppm is. I have ordered the TF-100 kit and am waiting for it. Can anyone tell me if this kit's block reads higher than 5ppm? Long story short, because my pool is still green and cloudy I SLAM'd it this evening with 123oz of 12.5% LC. I realize I need to be patient but it's been 4 hrs of circulation and I am seeing NO improvement. I brushed walls and bottom as best as I could, given I can't see them clearly. What else do I need to do? I'm sure I've forgotten some details here so fire away- maybe it will jog a memory. Thanks for the help- I hate to think I would have to do a complete drain and refill.