What is the additional cost to order this unit with a saltwater chlorinator instead of the traditional chemical chlorine system? We have a saltwater pool and would like to find a saltwater spa as well

To add a saltwater chlorine generator to a 110 volt Avalon hot tub, we recommend you consider adding one of our aftermarket chlorine generators. http://www.spasandstuff.com/spa-hot-tub-chemicals/hot-tub-saltwater-systems.html