Is a salt water pool less harsh than chlorine if your child has a documented allergic reaction to chlorine swimming pools and hot tubs?

All chlorine comes from salt weather it is made fresh from a generator or in tab form chlorine or Bromine. You may want to consider Ozone. Or Bromine All salt pools have chlorine in them that is what the salt is for. The small amount of diluted salt is run thru the salt generator and thus produces chlorine. The amount of salt in you or any pool can not be perceived by the body. It is in such small quanties. Not even close to that of the ocean. Apparently no one explained the system to you when it was installed or perhaps you forgot or were not listening. Google pool salt systems and get informed.