Ozonators are common features on many spas and have been for at least the last 15 years. The spa must have a Plumbing feature known as a venturi to facilitate the use of the ozonator. The venturi provides a mild suction to deliver the ozone to the spa water. If the spa was not created with a venturi in the plumbing it can be problematic to install one. As for salt water sanitation systems I have not seen one in use on a spa and I've been repairing and installing for 20 years. The concept is sound but the cost would prohibit the use.
They can work in SPAs , Beauty salon, Etc.,
in each town have u click tje than chose work u will see it.
They can work any of the seven days of the week. Most spas are open Saturdays and Sundays because that is when they get the most of their business.
no because it is to cold for normal salt to work any more
yes so long as you work out the right amount. Spas are a lot smaller then pools.
Cosmetologists work in salons, spas and their own private studios. There are some that work in strip malls and shopping malls. Cosmetologists work all over the world and in every country.
Road Salt works because salt has a higher freezing point.
Salt
easy
Of course, not.
by salt
Yes. If it were not soluble it would not work well as bath salt.