BioGuard’s Freshen Up is a water purifier designed to destroy a variety of contaminants including sweat, urine, lotions, dander and fertilizers. One bottle treats up to 30,000 gallons of pool water. Broadcast directly over the pool, swimmers may re-enter in as little as 15 minutes after application. Contact: BioGuard, (800) 859-7946; www.bioguard.com