Infinity® Underdrain
Unibody Design. Maximum Reliability.
Smarter Backwash Performance.
The Infinity® Continuous Lateral Underdrain from Roberts Filter Group is engineered to eliminate the common failure points of traditional underdrains. With a
single-piece unibody design, Infinity® removes joints and seals entirely, preventing leaks and ensuring long-term reliability. Compact at just 6 inches in height, Infinity® maximizes filter media depth and performance — making it a proven solution for both new installations and filter retrofits.
Why Choose Infinity®?
No Joints. No Seals. No Failures.
Infinity® is extruded to the exact required length as a single unibody component. This eliminates the risk of joint or seal failure, the most common cause of underdrain breakdowns.
Low-Profile Design
At only 6” tall, Infinity® increases available freeboard and allows for deeper media beds. In retrofits, this design brings new life to older filters by unlocking greater treatment capacity.
Versatile Top Deck
The integrated top deck can be configured for direct media retention (slots) or gravel support (orifices), without screws or fasteners that corrode or leak.
Superior Air/Water Separation
Infinity®’s six-channel design separates air and water conduits, preventing water hammer and maldistribution. This ensures even backwash performance across air-only, air/water, and water-only modes.
Fast & Secure Installation
Delivered fully assembled with no joints or tools required, Infinity® installs faster and more securely than conventional underdrains.
Applications
Municipal gravity filters
Surface water treatment plants
Groundwater and industrial filtration
Filter rehabilitation and retrofit projects
Benefits at a Glance
Eliminates grout, joints, and seal failures
Maximizes media depth and freeboard
Even air and water distribution across the filter bed
Faster installation with fewer components
Longest lifecycle reliability in its class
Lifecycle Support
Infinity® installations are supported by Roberts Filter Group’s full range of lifecycle services — from filter inspections and retrofits to media changeouts and turnkey installations.
Looking for the most reliable underdrain on the market?
Infinity® delivers unmatched performance, easy installation, and decades of dependable service.
