Chlorine is a gas at room temperature. It can be purchased in cylinders for the swimming pool industry. From there it depends on what you call expensive. You can't just go down to the local store and buy it. Solid chlorine would need to be stored at below -34oC . This would be expensive.
swimming pool
How much does a stinless swimming pool cost
There is no such thing.
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
Chlorine level should stay between 1.0 and 3.0 parts per million (ppm) to maintain a healthy pool.
The amount of chlorine needed for a pool can vary based on its size, the current chlorine level, and environmental factors. It's best to use a pool water test kit to determine the chlorine levels and then follow the manufacturer's instructions on how much chlorine to add to achieve the appropriate levels for safe swimming.
$10000000
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.