A Monolithic Filter Underdrain is an integrated filtration support system designed to provide uniform air and water distribution during filtration and backwashing. Constructed from high-strength reinforced concrete or composite materials, it ensures structural stability, efficient media cleaning, and long service life. Ideal for municipal and industrial water treatment plants, the monolithic underdrain offers low head loss, easy installation, and reliable long-term performance.
Seamless concrete underdrain with uniform air-water distribution, strong structure, easy installation, and low maintenance.
Cast in one piece without joints for superior strength and long service life.
Adjustable filter heads ensure even air and water flow during backwashing.
Precast components allow quick construction and reduced installation time.
Durable concrete and precision leveling minimize wear and clogging issues.
Delivers thorough media cleaning with minimal backwash water consumption.
Short construction period and reliable performance lower overall operating costs.
Weilan designs plans and drawings and supplies both standardized and bespoke water treatment systems, backed by over 200 completed projects.
Monolithic Filter Underdrain is poured without any joint, and the concrete is poured and shaped in one time on site, which makes the filter plate good in integrity and high strength.
Adjustable filter head adjusts the filter head level with high precision, which can adjust the air distribution hole of the whole filter pond to the same level elevation, thus distributing water and air more evenly.
The overall casting filter plate is easy to transport and install, with short construction period and low cost.
The air and water distribution is even, and the backwashing effect is good.
The filter media is thoroughly cleaned and the amount of backwashing waste water is small, thus the operating cost is lower.
Henan Weilan Water Treatment Technology Co., Ltd. (est. 2011) specializes in turnkey package
water treatment plants — modular, skid- and containerized systems pre-tested for rapid
on-site deployment.
Backed by an experienced R\&D and EPC team and ISO9001 quality management, Weilan
delivers engineered design, manufacturing, commissioning and lifecycle support for
municipal and industrial water projects.
Provide a total solution for safe drinking water and sewage treatment.
Full design services — standard modules and bespoke systems
This underdrain design offers excellent structural integrity, even air-water flow, and a long service life with minimal maintenance. Its seamless construction prevents leakage and clogging, ensuring stable filtration performance and efficient media cleaning with low backwash water use.
The system’s adjustable filter heads ensure uniform distribution of air and water, achieving complete and balanced backwashing across the entire filter bed. This results in thorough media cleaning, minimal channeling, and consistently high effluent quality.
Yes. Weilan Water Treatment customizes each system based on tank size, filtration media, and process requirements. Adjustable filter head levels and tailored air distribution designs ensure optimal performance for both new installations and retrofit applications.
The underdrain is constructed using high-strength reinforced concrete, ensuring excellent durability and load-bearing capacity. The integrated design eliminates joints and weak points, reducing the risk of cracking and ensuring long-term stability under continuous operation.
