Part of keeping your crawl space dry involves a sump pump. The State of the Art Smart Sump is designed just for crawl spaces. The liner and lid are designed to form a tight seal around the cleanspace liner. With that being said a great way of keeping the moisture at a comfortable safe level is by installing out SaniDry Sedona. The Sedona is the world's most powerful dehumidifier- it will eliminate damp, musty odors in your crawlspace by drying and filtering the air.