BiocideDoseCalus helps you run cooling towers with clear, simple math you can trust. It checks cycles of concentration from makeup and blowdown using chloride or conductivity. It figures blowdown rate from cycles, makeup, evaporation, and drift, and also estimates evaporation loss from heat load and range. Drift loss is easy too, using a drift percent and your circulation rate. The app balances water use to show makeup needed across evap, drift, and blowdown. It guides water health with LSI, RSI, and PSI so you can spot scale or corrosion early. Biocide dosing is straight: enter stock %, target ppm, and system volume to get liters to add. You can also size acid feed from alkalinity and target pH, so control stays tight and safe.