Drained about 30% of pool and refilled. Should I just use bleach and no pucks. Is there a good shock to use. I have plenty of pucks but i believe that got me in this situation.Please send help. water is still crystal clear but I cannot lower my cya level.I have plenty of pucks and 2#s of shock left, I would like to make sure I purchase the correct chemicals to get out of this situation.