Swimming salt.

No. You need a chlorine generator to turn the salt to chlorine.

No. The salt will be useless without an electronic salt cell to generate chlorine from the salt. When I had only a little wading pool, I bought granular chlorine (tri-chlor) and used Clorox test strips to keep the chlorine level in the proper range. Both of these are available at Lowe's.

No… You cannot use pool salt in a wading pool in order to chlorinate the water. In larger pools, the pool salt when dissolved in the pool water, works in conjunction with a chlorine generator cell that separates the dissolved salt into sodium and chlorine. The chlorine enters the pool and this "chlorinates" the water. With a small wading pool, you either change the water every couple of days or you periodically add some some granular chlorine (such as HTH brand) to keep the water chlorinated. This type of chlorine is unstabilzed. If you put unstabilized chlorine in pool water that is in sunlight, the sunlight breaks down the chlorine and its therefore not available as a sanitizer. The UV sunlight can do this rather quickly, so that's why you have to keep adding this unstabilzed chlorine to your wading pool. People with large pools use stabilized chlorine tablets. The tablets contain a chemical that shields or prevents the chlorine from being rendered useless by the sun's UV rays.