Griswold Centrifugal Separators can be installed in either full flow or side stream configurations. Griswold Centrifugal Separator Systems are designed as self-contained units for cooling tower and cooling system cleaning. Our Dual Stage High Efficiency Separators come in two configurations: our CSS model (with Auto Purge System – used for evaporative loops) and CSR model (Closed Solids Recovery System – used in non-evaporative loops.) Both models are compact, durable, economical, and effective filtration packages. Both systems come with their own pump (end-suction pump for flooded suction and self-priming pump for negative suction), pipe manifolds, pressure gauge, and basket strainer (standard on High Head systems). The CSS model has a pump control panel and a standard timer purge controller. The CSR model has a pump control with a closed solids recovery tank with pressure annunciator, sight flow indicator, and manual valves.


  • Reduces solids and fouling problems in cooling water system piping and equipment
  • Reduces labor costs associated with manual cleaning of tower basins, chillers, condensers, heat exchangers, and boilers
  • Improves performance and efficiency of heat transfer equipment
  • Reduces energy costs
  • Reduces environmental impact associated with (and minimizes discharge of) solids and chemicals into sewer stream
  • Helps control growth of bacteria
  • Industrial abrasion-resistant units available based on application


  • Chilled Water A/C Systems
  • Industrial Cooling Towers
  • Evaporative Condensers
  • Irrigation
  • Waste Water
  • Pre-Filtration

How it Works

The solids-laden stream of liquid enters the separator tangentially through the entry nozzel and is directed and accelerated by the velocity plate, creating a strong centrifugal force on the flow.  The accelerated liquid combined with the geometry of the exit tube creates a vortex in the middle of the vessel, maintaining the speed of the liquid.

Due to thier higher specific gravity, the solids stay outside the spinning liquid at the vessels inner wall circuference.  As these solids reach the spin plate, they breach the openings when the liquid reverses direction guiding the solids to the vessels center exit tube

Solid are retained in the collection chamber outside the influence of the vortex.  The collected solids settle at the bottom of the separator until exiting via the purge system.

Open the manual relief valve (1) after system installation to bleed off trapped air. Periodic bleeding of air should be done as part of a routine maintenance program.

The spin plate (2) deflects solids that may enter the vortex region and shortens the travel of vortex.

Solids pass the gap between the bottom spin plate and the inner wall of the separator (3), and are deposited in the collection chamber.

Bottom spin arrestors (4) help prevent solids from reentering the vortex. The collected solids settle to the bottom of the separator (5).