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Gravity Filtration Systems

Gravity Filtration Systems have been the cornerstone of water treatment for thousands of years. Filter underdrains, air scour, and surface wash systems are key components to ensuring high-quality water. 


Roberts Filter Group has a wealth of knowledge and experience in Gravity Filtration:

  • Design and Construction of New Installations

  • Rehabilitation and Upgrading Existing Installations 

  • Filter Inspections and Process Optimization Assistance

  • Instrumentation and Controls Additions

  • Upgrades to New and Existing installations 

Our experience in gravity filtration systems ranges from small prefabricated steel tank systems to multi-million gallon per day municipal systems. Our global install base spans the municipal and industrial water and wastewater treatment market, with diverse process applications used for turbidity reduction, organics reduction, treatment for taste and order, and other filtration challenges. 

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Filter Underdrain

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Surface wash systems are buried in the top of the filter media or are suspended above the filter media surface. Rotating arms use jets of water to break up the clogged filter surface and to rotate a movable arm through the filter material. A surface wash step in a backwash cycle usually takes place at the beginning of the filter bed cleaning process

Roberts Filter Group offers a Surface Wash Agitator and individual parts. like cone ported nozzles.

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