The shock I've been using is Pace Clear Shock - 99% sodium dichlorio-s-triazinetrione hydrated.

OK, hopefully my troubles are almost over. Like I said, when I woke up the pool was clear. I took a water sample to a local store and here's what they found.

CYA - 40
Tot Chlorine 0
free chlorine 0
ph - 6.2

Tot Alkalinity 0

They wanted to sell me 50 lbs of Balance pak 100 to increase the Alkalinity.

I didn't buy anything, I just added two lbs of "pace" shock. It's 99% sodium dichlorio-s-triazinetrione hydrated.
Please help. What should I do about the Alkalinity, PH and pool using so much shock? I can't keep the levels up. Thanks again.