TripleSafe is a top-of-the-line sump pump that has a powerful, cast-iron Zoeller ⅓ horsepower sump pump set at the lowest level. For heavy volumes of water or in case of primary pump failure, a second, more powerful Zoeller ½ hp pump set a bit higher in the liner, will take over. Complete with a battery back-up, the TripleSafe Sump Pump is the best sump pump on the market today.