The principal chemical in the BaquaSpa Water Care System. A bromine-free, chlorine-free liquid sanitizer that provides effective control of bacteria and protects against staining and discoloration due to metals. It stores indefinitely, is highly stable in elevated temperatures, and lasts longer than bromine- or chlorine-based sanitizers. NOTE: THIS PRODUCT IS NOT COMPATIBLE WITH CHLORINE OR BROMINE. ONLY TO BE USED WITH BAQUASPA PRODUCTS!