The Filter Underdrain Block System ​

Advanced underdrain technology imported from the United States, developed by a company founded in 1924. Designed to enhance production capacity and filtration efficiency in both retrofit and new construction projects, this system offers superior backwashing performance, extending the service life of filter media and significantly reducing backwash water waste.​

The system utilizes a combined air-and-water backwash design, providing better cleaning compared to water-only systems. Leopold’s Dual Parallel technology ensures even distribution of air and water, minimizing the occurrence of dead zones. With its extended structure, the system increases filtration area, improves throughput, and lowers operational costs. Lightweight and easy to install, it meets the ANS/NSF 61 certification standard. To date, it has been installed in over 75 projects since 2009.​
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