I come back to ammonia in the water. I had that problem a few years ago when we bought a house with a "swamp". Once the water was clear, I would add 12-16ppm of chlorine each day, and it would be gone the next morning. However, my cc was off the charts so that's one difference between our situations. If it is ammonia, then there is no way to know how much chlorine it will take to clear it up. You could be good tomorrow, or it could be another 200 gallons (yes, gallons) of bleach. After about 40 gallons of bleach, I decided to drain and refill the pool. 24 hours later we were swimming. I can't say for sure this is your problem, but if your cya dropped since you closed the pool, then it's a definite possibility.