Microbiological activity in cooling water systems is an often-overlooked issue that can quietly compromise system efficiency, increase operating costs, and accelerate equipment wear. While scale and corrosion frequently take center stage, microorganisms—including slime-forming bacteria, algae, and fungi—can also lead to serious system fouling, poor heat transfer, and even health hazards if not properly managed.
At Watertech of America, we help industrial and commercial facilities take proactive steps to identify, monitor, and mitigate microbiological risks in their cooling systems. Our integrated approach combines expert insight, advanced testing, and hands-on service to maintain reliable, high-performing systems.
The Hidden Threat of Microbial Growth
Microorganisms thrive in the warm, moist environments of cooling towers, basins, and piping.
Common culprits include:
- Slime-forming bacteria that adhere to surfaces and impede water flow.
- Algae, which flourish in sunlight-exposed areas like the tower top deck and sump.
- Fungi, which attack wooden components, causing structural damage.
These organisms can form insulating biofilms on heat transfer surfaces, increase corrosion rates, and restrict water flow—leading to rising temperatures, reduced Delta T, and higher system pressures.
Early Warning Signs of Microbial Activity
Be on the lookout for these indicators of potential fouling:
- Elevated process water temperatures
- Decreased Delta T across heat exchangers or towers
- Increased pump pressure or decreased vacuum pressure
While these symptoms may stem from multiple causes, they often signal microbial growth—and require informed evaluation.
Proven Strategies for Microbiological Detection
Watertech recommends a systematic approach to identifying and responding to microbial contamination:
1. Monitor System Data
- Review daily log reports for abnormal trends.
- Analyze service reports from your water treatment provider.
- Talk with operating staff about any recent changes in treatment, equipment, or process conditions.
2. Inspect Key Areas
- Use tactile inspection to feel for slime on wetted basin walls or supports.
- Visually examine the distribution deck and sump for buildup or biological masses.
- Sample tower basin water and assess color, clarity, and odor.
3. Perform Onsite Testing
- Conduct a Total Plate Count or use microbiological dip slides to measure bacteria, mold, and fungus populations.
- Compare results to past data to identify trends or emerging issues.
- For slimy masses, microscopic examination can confirm biological origin.
4. Physically Inspect the System
- Examine fill material and supports for fungal decay or structural damage.
- Probe wooden structures with a tool like an ice pick to locate soft spots.
- Document inspection findings and compare over time for better system insight.
Partner with Experts for Long-Term Reliability
Sometimes, even experienced operators miss subtle signs of biological activity. That’s why Watertech provides in-depth inspections and consulting from Technical Engineers who specialize in cooling system optimization. Our team has the tools and knowledge to assess microbiological threats and customize a program that keeps your system clean, safe, and compliant.
Your Cooling System Deserves More Than Just Chemical Treatment
Watertech’s comprehensive cooling water programs include biocides, microbiological testing, remote monitoring, and smart automation solutions—all designed to protect against biofouling and ensure long-term efficiency.
Start with a site survey today to get personalized recommendations based on your facility’s specific conditions.
