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Cooling Tower Water Filtration: Controlling Solids in Open Recirculating Systems

Learn how cooling tower water filtration helps reduce suspended solids, basin sediment, fouling, and maintenance in open recirculating cooling systems.

Cooling tower water filtration addresses one of the basic realities of open recirculating systems: the water is constantly exposed to air, dust, biological material, corrosion products, scale particles, and other debris. Those solids can settle in basins, load strainers, foul heat-transfer surfaces, and increase maintenance effort over time.[1][2]

Filtration is not a replacement for a cooling tower water management program, chemical treatment, biological control, or routine inspection. It is a mechanical support strategy. By reducing suspended solids, a properly selected filter can help keep the circulating loop cleaner and make the rest of the maintenance program easier to manage.[3][4]

What Filtration Can Improve

  • Sediment accumulation in tower basins and low-flow areas
  • Particle loading on strainers, valves, spray nozzles, and heat exchangers
  • Cartridge or bag filter replacement frequency in downstream equipment
  • Maintenance labor tied to basin cleaning and fouled components
  • Water-quality stability during dusty, seasonal, or construction-related conditions

The right cooling tower filtration approach depends on the system objective. Side-stream filtration can gradually reduce solids in the recirculating volume, while full-flow or point-of-use filtration may be needed when sensitive equipment must be protected before water reaches it.[5][6]

References

  1. DOE FEMP, Side Stream Filtration for Cooling Towers: https://www.energy.gov/cmei/femp/water-efficient-technology-opportunity-side-stream-filtration-cooling-towers
  2. ASHRAE Handbook, Cooling Towers: https://handbook.ashrae.org/Handbooks/S20/IP/s20_ch40/s20_ch40_ip.aspx
  3. CDC, Controlling Legionella in Cooling Towers: https://www.cdc.gov/control-legionella/php/toolkit/cooling-towers-module.html
  4. GSA, AWT for Cooling Towers Guidance: https://origin-www.gsa.gov/governmentwide-initiatives/federal-highperformance-buildings/highperformance-building-clearinghouse/emerging-technology-evaluations/water/awt-for-cooling-towers-guidance
  5. U.S. EPA, Total Solids: https://archive.epa.gov/water/archive/web/html/vms58.html
  6. U.S. Geological Survey, Turbidity and Water: https://www.usgs.gov/water-science-school/science/turbidity-and-water

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