why is my baquacil oxidizer disappearing ? I add 3 cups and it is gone by the foll wing day. The water looks clear. In the past, I would add 3 cups every Saturday along with the other chemicals. I know that they added the CDX, but I have never had to use it before and I can't afford it now. I just want to know why my oxidizer is disappearing in just 2 days when it used to last more than a week. Someone please help, this is getting very expensive.