Plastic underdrains are economical and widely applicable– but they are not all created equal.


While similar on the outside, what truly matters is
the engineering inside. During a filter backwash cycle, the internal structure must efficiently balance air and water, regardless of changing flow rates or seasonal water temperature fluctuations. If not, conventional filter backwash cycles will be ineffective, maldistribution of water will lead to poor washing, and your system’s effectiveness will be undermined.

The Roberts Filter Group’s Trilateral underdrains incorporate innovative hydraulic design to uniquely
guarantee balanced flow backwash distribution.
Drawing on more than 125 years of industry
expertise, the triangular internal chamber is engineered to optimize air scour capabilities in any
conditions, without the need for custom design. And because Roberts can simulate any system’s
characteristics at our own manufacturing and testing facility, you can trust your installation will
perform even before it’s shipped.

Combined with a reinforced porous plate, long-lasting material and a low profile, the Trilateral
underdrain is the industry’s most reliable and economical solution.

© 2020 by Roberts Filter Group.

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