Despite having a sump pump in your basement, sometimes they can stop working, which can lead to the problem you're trying to avoid by installing the pump -- flooding.
Sump pumps can stop working if the power goes out, a circuit trips, or the pump comes unplugged.
Also, the sump pump could become overwhelmed by too much water, causing it to stop working properly.
Because it's not possible to prevent these problems from happening completely, a TripleSafe sump pump is the best option for ensuring your basement is safe, even when the power is out or rain is heavy.