Unless you have an ozonator, which would inject ozone (O3) to sanitize, there are no gases added to the water of a swimming pool.
I would not suggest a water trampoline for your home swimming pool. You can not control the trajectory when you jump and injuries could be caused if you strike the pool skirt.
To keep your swimming pool clean you will need a filters and a water pump. A vacuum would as be a good idea.
Swimming pool water can be what ever temperature you would like it to be just not too cold or too hot just need to have a little relaxation. :)
it means your swimming in a pool with dirty water and fish.....get out!
Reduces alkalinity of swimming pool water (softens hard water)
Chlorine is added to swimming pool water to disinfect it.
Macroscopic
turn the water yellow
Kiloliters or gallons depending on sizeo f the pool.
They may exist, but it is not likely. That is because a 100m swimming pool would be too inefficient. It would be to large and would require too much space, water, and chemicals.
Improper water chemistry - stay out of the pool until they learn how to properly maintain a swimming pool. Last measure would be to test the water yourself for proper chemistry.