swimming pool
To disinfect it.
Chlorine is added to swimming pool water to disinfect it.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
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
If the combined chlorine in a swimming pool is a negative number, it indicates a testing error or miscalculation. It's important to retest the water using a reliable pool water testing kit to get an accurate reading. Negative combined chlorine levels are not physically possible in a swimming pool.
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