What Is Free Chlorine In A Hot Tub. Free chlorine is the chlorine that isn't combined with anything. This is the value you actually test for.
If you neglected the tub and have stuff growing in it then you may need to shock the tub with 10 to 15 ppm free chlorine to kill the growing stuff and have a residue in it. However, changes in how many people are using the spa, how long people are soaking, and other factors can affect the chemical levels of your spa. These can lead to skin irritation and disease.
If these levels peak past these ranges, your water chemistry can become compromised.
Free chlorine is the chlorine that is not mixed with something. The center for disease control and prevention (cdc) recommends that chlorine levels be between 1.0 and 3.0 ppm for safe hot tub use. Chances are the standard chlorine sanitizer you used is being overwhelmed by the number of. To get rid of the chlorine smell, you need to add a very high amount of chlorine to the water to get rid of the chloramines and still leave enough in the hot tub to sanitize the water.
