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The function of a sump pump is primarily to remove water from basements or low-lying areas. This device is typically installed in a pit, known as a sump pit, which is located at the lowest point of a home’s basement or crawl space. Its main purpose is to prevent flooding and moisture accumulation by automatically pumping out water that collects in the pit, especially during heavy rainfall or when the groundwater level rises.

This is crucial for maintaining a dry environment in basements, which helps prevent water damage, mold growth, and other issues associated with excess moisture. By ensuring that water does not accumulate, the sump pump plays a vital role in protecting the integrity of the structure and maintaining a safe living space.

The other options do not accurately describe the primary function of a sump pump. Increasing water pressure, distributing water to gardens, and filtering toxins from water are functions associated with different types of plumbing or water systems, rather than with the specialized purpose of a sump pump, which is solely focused on water removal.