The Leisure Time Spa Sanitizer Reserve 1 qt. - LT45300EACH is a specially formulated mix of bromide salts that becomes a powerful bromine sanitizer when combined with Leisure Time Renew. Not only is this two-part system completely chlorine-free, but there are no unpleasant side effects typically associated with other non-chlorine sanitizing systems. Use Reserve as part of the Reserve & Renew Sanitizing System.