It depends how much you use it. If you use it a lot then yes. If you don't use it a ton then you don't need it. however if it is outside then it needs chlorine no matter how much you use it.
You would still need to put chlorine in it because different people pee in it because it is a public pool. So you need to put chlorine in it to keep it clean.
swimming pool
To disinfect it.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
Chlorine is added to swimming pool water to disinfect it.
If your talking about Swimming pool its because your pool has chlorine in it and chlorine kills fish :(
chlorine
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.
You can buy a skimmer at Target for about $12.00. I have a small 10ft. pool and it works fantastic
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.
Probably the chlorine. I doubt if chlorine is healthy for frogs.
the higher the temp the quicker the chlorine loss
You can swim in a pool without chlorine or salt they just keep the pool clean. but if you do it can give you bad skin