Calculate cycles of concentration from conductivity readings and get an instant assessment of your water treatment status.
Enter makeup and blowdown conductivity values to calculate CoC.
CoC = Blowdown EC ÷ Makeup EC. Optimal range: 3–6 cycles. Higher CoC saves water but increases scaling risk.
The easiest method is conductivity: measure the electrical conductivity (µS/cm) of both the makeup water supply and the circulating water in the basin. CoC = Basin EC ÷ Makeup EC. You can also use chloride or calcium hardness test kits for a cross-check.
As CoC rises, dissolved minerals like calcium carbonate, silica and sulfates exceed their solubility limits and deposit as scale on heat exchange surfaces. High concentrations also increase corrosion rates and can inhibit biocide effectiveness, raising Legionella risk.
Increase the blowdown rate — either by opening the blowdown valve more or by lowering the conductivity setpoint on an automatic bleed controller. This discharges more concentrated water and brings in more fresh makeup water, reducing CoC.