Cooling Tower Water Treatment Chemicals: A Complete Guide

Recirculating cooling water concentrates dissolved solids 3–5× through evaporation, promoting calcium carbonate and silica scale on heat exchangers.

Galvanic corrosion attacks carbon steel, copper and aluminium components when dissolved oxygen and chlorides are present.

Microbiological growth — including Legionella pneumophila — thrives in warm recirculating water and must be controlled with biocides.

Biofilm formation reduces heat transfer efficiency and increases energy costs; dispersants help remove existing biofilm and prevent reformation.

Scale and corrosion inhibitor (zinc-based or molybdate-based) dosed continuously to maintain protective film on metal surfaces.

Oxidising biocide (sodium hypochlorite or bromine) for daily microbiological control; non-oxidising biocide (isothiazolinone) for slug dosing.

Bio-dispersant to penetrate and remove biofilm from fill media, basin walls and heat exchanger tubes during shutdown cleaning.

pH control with sulphuric acid or caustic soda to maintain LSI within acceptable range (typically −1 to +0.5) for scale prevention.

Conduct make-up water analysis and cooling tower mass balance before selecting chemical programme — hardness, alkalinity and chloride drive product selection.

Implement blowdown control based on conductivity setpoint to manage cycles of concentration without excessive water waste.

Maintain daily logs of pH, conductivity, free chlorine and corrosion coupon weight loss for compliance and programme optimisation.

Source cooling tower chemicals from suppliers offering integrated programmes, on-site water analysis and pan-India delivery from Gujarat.

Drashti Chemicals stocks related industrial chemicals from Vadsar with batch COA, MSDS and GST invoicing (24AGLPC6288M1ZX). We are a supplier/stockist — share grade and quantity for a documented bulk quote. No public list prices.