HTH™ Pool Care Algae Guard Advanced: All In One AlgaecideBe 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. HTH's all in one algaecide destroys and prevents all types of algae Swim immediately Compatible with all swimming pools Powerful All In One Algaecide HTH Algae Guard Advanced effectively destroys and prevents heavy green, black and mustard algae blooms. Non foaming, fast acting Add HTH Algae Guard