The H2Optimum Siphonic toilet is the highest water-saving gravity flush toilet available! With a flush rate of 1.1 gallons per flush, the H2Optimum will grant you maximum water savings, without compromising on great performance. Round front design saves space in smaller bathrooms. Features our revolutionary EverClean surface inhibits the growth of stain and odor-causing bacteria, mold, and mildew on the surface for a toilet that stays cleaner, longer.