Temperature
Temperature is a critical design parameter. It has significant effects on feed pump pressure requirements, hydraulic flux balance between…
TDS (Total Dissolved Solids)
TDS, in water treatment, is the inorganic residue left after the filtration of colloidal and suspended solids and then…
Sulfate (SO4)
A divalent anion. The solubility of calcium, barium and strontium sulfate is low and can cause a RO scaling…
Strontium (Sr)
A divalent cation. The solubility of strontium sulfate is low and can cause a RO scaling problem in the…
Sodium (Na)
A monovalent cation. The solubility of sodium salts is high and does not cause a RO scaling problem. Sodium,…
Silica (SiO2)
Silica (silicon dioxide), in some cases, is an anion. The chemistry of silica is a complex and somewhat unpredictable subject.…
SDI (Silt Density Index)
An empirical test developed for membrane systems to measure the rate of fouling of a 0.45 micron filter pad…
ppm as CaCO3
A method of reporting the concentration or "equivalent" weight of an ion or substance in a given volume of…
ppm (parts per million)
A method for reporting the concentration of an ion or substance in a water. The following conversions apply…
ppb (parts per billion)
A method to report the concentration of an ion or substance in a water. The following conversions apply…