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Cooling Tower Water Treatment

Commercial and Industrial Cooling Towers



Legionella Prevention

Cooling towers, if not treated properly, can become the source for spreading Legionella as the aerosol spray from towers can travel for several miles. The most common form of prevention is to inject a liquid biocide on a routine basis to disinfect the cooling tower water. Liquid biocides can be injected into the water to prevent the formation of Legionella, the bacterium that causes Legionnaires’ disease. Stenner’s peristaltic pumps are a popular choice for metering biocides as they do not lose prime from off-gassing and are self-priming up to 25 feet.

Corrosion and Scale Control

Stenner pumps provide accurate injection of solutions to prevent corrosion and the formation of scale on plumbing pipes and fixtures in a water supply. Corrosion damage to pipes can lead to leaks and the formation of scale on the inside which reduces the area available to carry water. Injection of polyphosphates as an anti-scalant is a popular solution for corrosion control. To battle scaling and biological fouling, Stenner peristaltic metering pumps are used to meter corrosion inhibitors such as polyphosphates and biocides such as chlorine and bromine. Polyphosphate can be used full strength or diluted with soft water to make a solution of suitable strength for desired residual.

pH Adjustment

Stenner pumps offer activation options for injecting sodium carbonate, sodium hydroxide, and acidic products for pH adjustment. The pH level in water largely impacts how the water will affect equipment or it can impair oxidation.  In cooling towers, low pH water can be corrosive to pipes, valves and fittings. High pH water can cause scale to form to clog the pipes and inhibit the water flow. Some applications also require the addition of sulfuric or hydrochloric acid for pH control to maintain the water chemistry balance required for efficient operation of the cooling tower system.


The buildup of microorganisms in cooling tower water results in a slime (biological growth) problem. The slime may include bacteria, fungi and/or algae. System impacts include pressure loss due to fouling of piping, increased corrosion, and loss of heat exchange efficiency due to coating. Stenner pumps are ideal in metering chlorine as an oxidizing biocide to control biological growth in most commercial and industrial cooling towers. The vapor gas buildup when metering chlorine is easily exhausted through the roller rotation of Stenner’s peristaltic pumps.

Depending on the required flow rate and back pressure requirements, and proportional metering need, Stenner has a complete product lineup to satisfy your application demands.

Key Products

Pumps Type Flow Rate Output |
Operating Pressure Maximums
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Multiple Functions
US Standard 315 gpd | 25 psi
125 gpd | 100 psi

Metric 1192 lpd | 1.7 bar
473 lpd | 6.9 bar
4-20mA Input
US Standard 150 gpd | 25 psi
60 gpd | 100 psi

Metric 568 lpd | 6.9 bar
227 lpd | 6.9 bar
Variable Speed
US Standard 150 gpd | 25 psi
60 gpd | 100 psi

Metric 568 lpd | 1.7 bar
227 lpd | 6.9 bar
US Standard 170 gpd | 25 psi
34 gpd | 100 psi

Metric 514.8 lpd | 1.7 bar
102.6 lpd | 6.9 bar
US Standard 85 gpd | 25 psi
40 gpd | 100 psi

Metric 3.22 lpd | 1.7 bar
151 lpd | 6.9 bar
Variable Speed
US Standard 50.7 oz/hr | 80 psi

Metric 1499.4 ml/hr | 5.5 bar
Timer Activated
US Standard 15 gpd | 25 psi
21.7 gpd | 80 psi

Metric 56.8 lpd | 1.7 bar
82 lpd | 5.5 bar