I have the Intex SWG set to run 9 hours at night. When it starts, all the correct lights are on and I can see the chlorine being generated. I have checked the unit with 2 hours remaining in the cycle, and can't see chlorine in the generator. Pump and filter are working, correct lights are on. If I push the lock/unlock button, as to change run time, then push lock/unlock again it begins generating chlorine again. Also, the cells have just been cleaned. How do I fix issue? Thanks