Yes with most of them there is an arow moulded into the plastic somewhere,
No
not salt water, but its better for your health! Salt is not a pool cleaner, it is usually there to make chlorine via a "salt system"
You need a salt water chlorinator. A salt water chlorinator is an electronic devise that converts the salt in the water from the pool into chlorine gas that is then absorbed into the water.
Read the instruction manual
Yes if you are using a chlorinator. salt is sodium chloride and the chlorinator converts it to sodium hypo-chloride which is chlorine.
This compound is sodium hypochlorite - NaClO.
A fresh water swimming pool is a swimming pool that does not use a saltwater chlorinator. A pool that used a salt water chlorinator has salt added to it to so that a salt water chlorinator can electronically convert part of the salt into chlorine. A fresh water pool has chlorine added to it directly either manually or Automatically.
The same as any other pool.
In order to purchase a salt chlorinator you can visit almost any pool supply store near you. Also there is a very large variety you can buy online from various sources.
preferred after the filter and the heater.
Most pool shops carry it and some department stores and hardwares
Yes You can. As a matter of fact the salt will actually make the water feel better to swim in. In a salt water pool the concentration of salt is about the same as that you would find in tear drops, this makes the water easier on the eyes. Salt water pools are in fact chlorinated pools where the salt in the water is run through a chlorinator that produces the chlorine electronically. So there is nothing to worry about.