None unless you have a leak.
swimming pool
No.
Chlorine is used to disinfect Swimming Pools.
To disinfect it.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
Chlorine can be harsh on the skin. Prolonged exposure to chlorine, such as in swimming pools, can strip the skin of its natural oils, leading to dryness and irritation. It is recommended to shower after swimming to remove chlorine residue from the skin.
Chlorine can be found in swimming pools and cleaning products such as bleach. It can also be found in tap water if it has been treated with chlorine for disinfection purposes.
chlorine
the higher the temp the quicker the chlorine loss
Probably the chlorine. I doubt if chlorine is healthy for frogs.
No. In fact chlorine is added to swimming pools to kill bacteria.
No it does not have to be. It is just a measure of how usable the chlorine is.