Sulphate is a constituent of TDS and may form salts with sodium, potassium, magnesium and other cations. Sulphate (so4-2) is widely distributed in nature and may be present in natural waters at concentrations ranging from a few to several hundred milligrams per litre. Sulphate can cause scale build-up in water pipes. Sulphates are also food for theAnaerobic slime formers the sulphate reducing bacteria which are responsible for pitting type of corrosion in pipes.The AQUASOL water test kit for sulphate is based on titrimetry and is extremely user friendly.