I've been very grateful for the Pool Forum and found that it saved me a fortune in treatment costs last year while giving me a pool that practically ran itself, other than the bleach I added each day. This year I'm having trouble getting the pool to stay clear, though, and I can't figure out why. It starts to green up after only a few days of "normal" treatment. A year ago I was adding 1 qt/day in the evening of 6% bleach to my 9500 gallon Doughboy pool to maintain a residual of 2ppm. This year it's taking 2 qts/day and it just isn't getting the job done. Current numbers from the WalMart 5 way kit:

Cl 3ppm (I added 1 1/2gal 6% bleach 10hrs ago)
pH 7.3
Total Alkalinity 12ppm
CYA 20 ppm

Over the last 3 days we've added 3 gallons of 6% bleach and 3 generic "shock" packets that should add 10ppm each in order to try to keep the Cl level above 10 as continuously as possible for shock treatment. The pool is still tinged green. What's the deal?