Backwash - The process in which beds of filter or ion exchange media are subjected to flow opposite to the service flow direction to loosen the bed and to flush suspended matter, collected during the service run, to waste.
Bacteria - Unicellular micro-organisms which typically reproduce by cell division. Although usually classed as plants, bacteria contain no chlorophyll.
Base - A substance which releases hydroxyl ions when dissolved in water. Bases react with acids to form a neutral salt and water.
Bed - the ion exchange or filter media in a column or other tank or operational vessel.
Bed Depth - the height of the ion exchange or filter media in the vessel after preparation for service
Bicarbonate Alkalinity - he alkalinity of a water due to the presence of bicarbonate ions.
Biochemical Oxygen Demand - the amount of oxygen consumed in the oxidation of organic matter by biological action under specific standard test conditions. Widely used as a measure of the strength of sewage and waste water.
Brine - a strong solution of salts, such as the sodium chloride brine used in the regeneration of ion exchange water softeners, but also applied to the mixed sodium, calcium and magnesium chloride waste solution from regeneration.