The underdrain evacuates filtered water from the filter during the filter run and introduces water and air during backwashing and air scour. Leopold employs an underdrain system featuring advanced Leopold® Type S® technology. Leopold® Type S® technology underdrain is designed to provide uniform distribution of wash water and air to clean every corner of the filter without media upset.

Type S® underdrain is ideal for designs requiring longer laterals. Type SL® underdrain features a lower profile, making it ideal for shallow filters where greater filter media depth is desired. Both feature the dual parallel lateral design pioneered by Leopold, ensuring uniform distribution of water and air at each dispersion orifice opening even in extra long lengths. Both feature a unique water recovery channel for superior air scouring and water backwash performance. Both are constructed of high-density polyethylene (HDPE) construction for strength and corrosion resistance.

For assistance in selecting the right Leopold® Type S® technology underdrain for your installation, contact the Leopold Application Engineering Group.

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