Part of keeping your crawl space dry involves a sump pump. The state of the art SmartSump is designed just for crawl spaces. The liner and lid are designed to form a tight seal around the Cleanspace liner. Since you don't go into your crawl space a lot, you need to know if there is a plumbing leak. The SmartSump has a unique lid design so water from a plumbing leak fills an alarm pocket on the lif first, sounding a WaterWatch alarm. From there, the water flows down a special airtight floor drain that lets water down, but damp air cannot come up into your crawl space. The alarm also alerts you to pump or power failures.