A failure to match makeup water quality to system requirements leads to tangible, costly consequences. (calcium carbonate, calcium phosphate) acts as an insulator, reducing heat transfer efficiency by 30-50% and forcing higher energy consumption. Corrosion from low pH or aggressive ions (chlorides, sulfates) can puncture heat exchanger tubes in months. Microbiological fouling from algae, Legionella, or biofilms accelerates corrosion, plugs fill media, and poses serious health risks.
You cannot manage what you do not measure. Installing accurate flow meters on the make-up water line and the blowdown line is essential for calculating CoC and identifying leaks. A sudden spike in make-up water usage often indicates a leak or a stuck float valve.
Makeup water is the fresh water added to the system to replace these losses and maintain a constant operating level in the basin. Why do we need it? A cooling tower doesn't just "use" water; it loses it in three primary ways: Evaporation: This is the main cooling mechanism. Pure water turns into vapor, leaving behind minerals and contaminants. Blowdown (or Bleed): To prevent minerals from becoming too concentrated and causing scale, some water is intentionally drained from the system. Drift: Small droplets of water are carried away by the air flowing through the tower. High-quality drift eliminators can reduce this loss to nearly zero. The Importance of Water Quality You can't just pump in any water and expect your system to last. Makeup water quality varies significantly depending on its source—whether it’s municipal tap water, well water, or reclaimed "grey" water. The Risks of Untreated Water If your makeup water isn't properly treated before entering the tower, you face several expensive problems: 14 sites Make up Water Treatment: Best Practices for Cooling Towers Sep 11, 2025 —