Product Spotlight – Water: December 2020

Product Spotlight – Water: December 2020

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Underdrain offers backwashing feature

The use of an underdrain enables utilities to collect filtered water during the filter run, and distribute air and water during the backwash cycle. Providing cleaner filters mean longer filter runs and higher water efficiency, more product water and less waste. This lowers operating costs per gallon of filtered water — creating a benefit to cost-conscious utilities. The Leopold Type 360 is a bolt-down underdrain system for water treatment filtration rehabilitation projects that actually flows backwash water in a 360-degree pattern, increasing efficiency by up to 20%.

“The industry challenged us to create an underdrain that combines efficiency, straightforward installation and individually serviceable laterals,” says Matt Schomaker, regional sales manager for Xylem Treatment. “The Leopold Type 360 underdrain is completely different than anything else on the market. Our game-changing, bolt-down under-

drain design allows for longer filter runs, higher efficiencies, uses less backwash water and extends media life.”

With an uplift resistance above 15 psi, the Leopold Type 360 can withstand most unexpected events, such as water hammer. It has 0.2 mm slots and orifices on the top, sides and bottom of the underdrain block to effectively clean the filtration media from every angle during the backwash process, completely eliminating media dead zones due to gaps in backwashing coverage. By washing 100% of the media in between each lateral, the Type 360 underdrain increases filter run times, reduces backwash water consumption and extends media filter life, resulting in lower operating costs and more energy savings.

The unit is compatible with all standard flume and air configurations, and with lateral lengths over 40 feet, it is suitable for long filter runs and retrofits of existing filters. The modular underdrain blocks are easy to handle and snap together for quick and simple installation. Custom hold-down brackets secure the laterals and simplify installation and service of individual underdrains. Its reinforced polymer construction provides strength against the elements while reducing the overall equipment weight for easier transportation and installation. The polymer matrix is 100% corrosion-free to ensure a maximum filter lifetime. A self-cleaning feature removes sediment buildup in the underdrain over time.

According to Schomaker, the Type 360 underdrain solves current water challenges for biologically active filtration systems, indirect and direct potable reuse applications, new drinking water applications addressing the EPA’s LT2 rules regarding contaminants of emerging concern, and the rehabilitation of existing media filters. 



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