There are chlorine free pools. They usually contain salt water or bromine.
How does chlorine in a swimming pool kill bacteria ?
Any one or thing swimming in the pool will reduce the amount of free chlorine available in the swimming pool. Dog hair body fats and other impurity's will take up free chlorine in the pool thereby reducing the amount of effective chlorine available. Dogs bring into the pool more contaminants than do humans for AA lot of various reasons.
The swimming pool at the Landmark Hotel in London is 15-metres. It's a heated and chlorine-free swimming pool. One can enjoy swimming in this pool without worrying about the side effects of chlorine, especially if one is pregnant.
Add more liquid (12% or at minimum 10% strength) chlorine.
To disinfect it.
Chlorine is added to swimming pool water to disinfect it.
That would depend on the strength of the chlorine, the size of the pool, and the "Chlorine Demand" of the pool.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
The problem in a swimming pool with not enough amount of chlorine is that the harmfull bacteria wiil be not killed.
There are 3 components to the chlorine level in the pool. Total chlorine, Free chlorine, and Combined chlorine. Free chlorine is the chlorine available for sanitation.