A four-inch drain tile pipe, perforated with drainage slits, is then placed in the trench on the floor inside of your basement walls. The pipe is made from High-Density Polyethylene (HDPE). This versatile product is used in field drainage, landscaping, highway construction and many other areas. The drain tile is surrounded with an aggregate filter bed, which allows water in, while filtering out the surrounding soil. Because the drain tile is positioned next to the footings on the inside of the foundation, it is in a prime spot to alleviate numerous causes of water infiltration into your basement.