When a person becomes dehydrated due to the loss of fluids and solutes saline solution water salts is infused into the bloodstream by medical personnel Why is saline solution used instead of pu?

i think the "pu" is supposed to be pure water.

Using saline solution (Ringer's) will make the person hydrated and preventing hypovolemic shock or hypotension especially for those who having difficulty drinking or experienced physical collapse that cannot drink water right away.