I have a Hotspring Triumph since a year. I replaced the water 4 times since. A recurring problem is the fact that the free chlorine disappears quickly. When I add chlorine (via bleach) the reading via test strips indicates 10PPm. after 1=2 hour it is dropped to 0, while the spa covered and not in use. (we prefer to use it while open ) PH, alkaline and Stabilizer (CYA) are kept perfect referring to the the test strips.
Adding 5 ounce of bleach brings the Chlorine back to 10PPM. I am puzzled. The water is perfect in appearance and no odours or anything negative...
I don't want to cure an non-existing problem, but I would like to understand it.
Thanks for any reaction.