to kill all the bad things that might get in there when you go in it but doesnt hurt you
Usually saltwater.
No
Answer from a Stone Person Any natural stone or masonry surrounding a saltwater pools should be sealed for protection to prevent pitting and flaking for the surface called "Spalling", This is caused by saltwater splash-outs penetrating into porous stone or concrete. The product you need is manufactured by DuPont specifically for stone and masonry surrounding saltwater pools. It can be purchased online at the link below http://www.levantinausaec.com/d14226675.html
no
It could be fatal.
$10K -- $5M
Maybe concrete that they put in pools?
Mostly underwater brine pools and saltwater springs.
Salt water pools
Hydrochloric acid and potasium help alot
Saltwater makes up a majority of the oceans. It is a habitat for sea life of all sorts. It is also now used in personal pools.