TM 10-4610-232-34
SECTION Il. DEFINITION OF UNUSUAL TERMS
Accumulator — A device to reduce pressure surges caused by the high pressure pump (a vibration dampner).
AG media — Lightweight filter material turning the top media layer in the media filter.
Backwash — Semi-automatic process of cleaning the media filter.
Brackish water— Slightly salty water such as that found where a river enters the ocean and the outlet of a bed or
lagoon flooded by ocean tides.
Brine — Very salty rejected feedwater. Also called waste, concentrate, and reject.
Biological warfare agents — These are removed in the carbon filter of the NBC system.
Calcium carbonate — (Lime) A type of dissolved salt found in the raw water which may form scale on the reverse
osmosis elements.
Calcium hypochlorite — A form of chlorine used to control biological growth in water.
Calcium sulfate — A type of dissolved salt found in the raw water which may form scale on the reverse osmosis
elements.
Chlorination — The addition of chlorine to product water to prevent growth of micro organisms.
Concentrate — See “brine.”
Conductivity — Salinity or amount of salt in solution.
Contaminants — Any foreign substance found in the raw water or in the ROWPU systems.
Creep — Gradual increase in outlet pressure
Cuvette — Glass test tubes that are matched exactly in all dimensions. Cuvettes must not be scratched or get dirty
or results from chemical analyses will be inaccurate.
Cyclone separators — Devices which remove solids from a liquid through centrifugal action. The liquid is rotated
at high speed by its own velocity forcing the heavier solids out of the liquid.
Deionizer — A device for removing any remaining nuclear radiation in the product water. The deionizer is part of
the NBC filtration system.
Differential pressure — The difference between inlet and outlet pressures of a component. Also called pressure
drop.
Dissolved solids — Solid substances that must be removed from the raw water during purification.
Electro Magnetic Pulse (EMP) — The electrical and magnetic pulse wave generated by a nuclear weapon.
Feed water — Water input to the Water Purification System of the ROWPU.
Free chlorine level — Amount of chlorine present in product water, measured in ppm or mg/l.
Fouling — The deposit of solids on the surface of the reverse osmosis (RO) elements. Fouling is caused by
dissolved solids or biological growth.
Glossary-3
