Water Treatment Calculators

Estimates whether water will tend to precipitate scale (positive LSI) or dissolve protective carbonate films and corrode metal (negative LSI). The Ryznar index is calculated alongside as a cross-check. Used for boiler, cooling tower and general process water.

Works out how many times dissolved solids are concentrating in your system, and how much blowdown you need to hold a target cycle before scale or corrosion risk builds up.

Checks whether your RO skid is running at a healthy recovery ratio and whether membranes are still rejecting salts effectively — a quick way to spot fouling or scaling before flux drops.

Turns your 0.45-micron filter timer readings into an SDI value that tells you whether RO feed water is safe to run or needs better pretreatment. Standard ASTM D4189 procedure at 30 psi (2.1 bar).

Handheld meters read either conductivity (µS/cm) or TDS (ppm) — this converts between them using an adjustable conversion factor, since the exact ratio depends on your water's ion mix.

Converts hardness between the units different labs, imported equipment and older reports use — ppm as CaCO₃, German degrees, French degrees and grains per US gallon.

Two everyday calculations: how much product to add to hit a target dose, and how to dilute a concentrate down to a working strength.

Every litre blown down is hot, treated water going to drain — and fuel burned to reheat its replacement. This puts a rupee figure on your current blowdown rate and shows what you would save by raising cycles of concentration.

Running a tower at higher cycles of concentration cuts blowdown and makeup water directly. This shows how much water and money you would save moving from your current cycles to a target — the core business case for a proper inhibitor program.