The precipitation of sparingly soluble salts causes the RO membranes and their flow passages to foul. Hence, we provide an upstream scale inhibitor in the form of antiscalants. Calcium carbonate (CaCO3), calcium sulfate (CASO4), barium sulfate (BaSO4), and strontium sulfate (SrSO4) are some of the most common examples of scale, silica (SiO2) and calcium fluoride (CaF) scales are lesser common but more problematic.