HTH® Pool Care Algae Guard Advanced 1 quartBe all clear for more summertime fun! Use this powerful, non foaming formula to kill and prevent heavy amounts of algae blooms for crystal clear pool water. Destroys and prevents all types of algae Swim immediately Compatible with all swimming pools Powerful algae control HTH Algae Guard Advanced effectively destroys and prevents heavy green, black and mustard algae blooms. Non foaming, fast acting Add HTH Algae Guard Advanced directly to your