• Media Before Cleaning
  • Media After Cleaning
  • Media Before Cleaning
  • Media After Cleaning
  • Media Before Cleaning
  • Media After Cleaning
  • Media Before Cleaning
  • Media After Cleaning

Utility Service Group (USG) utilizes proven, patented and NSF-certified technologies for chemically cleaning the interiors of water storage tanks and granular filtration systems with the goal of restoring to like-new conditions and improving your return on large capital investments while lowering your related annual O&M costs.  Regular chemical cleaning of important water system infrastructure should be part of every water utility’s comprehensive preventative maintenance program.  Our highly qualified personnel can scientifically quantify the specific causes of inorganic and organic deposits and recommend a targeted solution for remediating your critical problems, while providing trained field staff to deliver each specific cleaning solution.


During typical granular filtration processes, inorganic particulates accumulate due to chemical reactions and specific microscopic bacteria (e.g. iron-oxidizing, manganese-oxidizing, sulfate-reducing).  These inorganic deposits can include calcium, magnesium, iron, manganese, silica, copper, aluminum, sulfate and phosphate.  These deposits lead to water quality problems and operational problems such as bed volume expansion, water and air flow restrictions, non-uniform surface features, and non-compliant effluent turbidity.  In addition, organic buildup (“biofilm”) can lead to similar water quality and operational problems and can increase disinfection requirements.

The presence of inorganic deposits and biofilm do not necessarily require media replacement if the media is structurally sound and can be restored to like-new conditions.  Utility Service will scientifically evaluate samples of your granular media – whether it be silica sand, torpedo sand, anthracite or greensand, and whether it be single or multi-media – to determine the efficacy of chemical cleaning and propose a customized approach to chemically clean the media in your gravity or pressure filters utilizing patented, NSF-approved products.  If however the existing media is shown to be at or very near the end of its useful life through our laboratory analyses, then Utility Service can assist the utility owner with complete replacement.


  • Increase System Capacity and Media Life:  Cleaning improves filtration efficiency and performance, reduces backwash frequency, and extends media life (if structurally sound).
  • Minimize Media Loss:  Deposits cause media volume to “grow” thereby causing problematic bed volume expansion.  Chemical cleaning can substantially reduce bed volume and lead to less media loss during backwash.
  • Maximize Efficiency:  Chemical cleaning leads to improved bed porosity as the media is restored as close as possible to design specifications, improved filtration ability due to significantly cleaner media particles, less cohesion of particles (e.g. due to calcium carbonates), and less detrimental effects from organic biofilm and inorganic deposits.
  • Better Regulatory Compliance: Post-cleaning IFE and CFE turbidities are improved, after sufficient backwashing and bed volumes are sent “to waste”.
  • Restoration:  The chemical cleaning process reconditions critical filtration components and extends the useful life of the system.  The figure below generally depicts the beneficial effect of regular cleaning.


FIlter Cleaning Chart

  • Bottom Line:  For cost-effective operations and optimum system performance, get regular cleaning and conduct routine maintenance.


Remove mineral deposits and biofilm that form on the surfaces of:

  • Filter Media
  • Walls of Gravity and Pressure Vessels/Basins
  • Underdrains
  • Troughs
  • Air Scouring Equipment (if applicable)


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Filter Maintenance Brochure
Filter Maintenance Program
We utilize proven, NSF-certified technologies for chemically cleaning the interiors of granular filtration systems. The goal of these cleaning filtration systems is restoring to “like new” conditions and improving your return on large capital investments — all while lowering your related long-term operation and maintenance costs. Download Brochure
Filter Maintenance Program

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