Since i openned my pool in early May, I have been expeiencing a huge chlorine demand. I thought my testing reagents might be old and giving me bad results so all have been replaced. i stll have chlorine demand of 6-10 ppm each day. Water is crystal clear. I have kept the pool above shock level for 9 days now and overnite i still lost 4 ppm. What could be my problem?? Here are my latest numbers- FC 26.5. Ph 7.6. Cc 0.0. tA 110. Stabilizer 50. My FC was well over 30 last nite at 11 pm.