What in the H E DOUBLE HOCKEY STICKS!!!! I lost 4 ppm last night. CC is .5. I am never going to pass this stupid test. No one has been in the pool. There is nothing in the pool. My cover is off. I think I must have the zombie algae that another poster may have. I scrub the walls every day. Oh. My. Gosh! I am so done. Does this just simply not work for some pools/people? OK... I take it back. There was something in the pool yesterday...BRAND NEW wiffle balls. That cannot be it. WHAT IS GOING ON?????????? HHHHEEEELLLLPPPPPP MMMMMEEEEEE, IIII'MMMMM GGGOOOIIINNNGGG NNNNUUUTTTSSS!!!!!! I have now been at this for a full month. Except for the first 4-5 days, the water has been crystal clear. So mad/irritated right now. Passing seems impossible!