I have a 2013 Hot Springs Sovereign, I had a problem with cloudy water, due to the fact, I did not shock it in 2 weeks, I shocked, but it was still milky cloudy, I used a clarifier, which helped, cleaned filters each time, shocked again, much better today, cleaned filters again and added clarifier again today, I measured my free chlorine and it was like at zero, why ? I have a ozonator, the total chlorine looks ok, but free chlorine is close to zero.