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An alphabetical listing of General terms and items. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Nanofiltration   A membrane treatment process which falls between reverse osmosisand ultra filtration on the filtration/separation spectrum. Natural Sparking Water   Carbonated water whose carbon dioxide content is from the same source as the water itself. Naturally Soft Water   Ground surface, or rain water sufficiently free of calcium and magnesium salts so that no curd will form when soap is used and no calcium or magnesium based scale will form when the water is heated. Neutral   (water chemistry) The midpoint (neutral) reading of 7.0 on the pH scale, indicating that the solution (water) producing the neutral reading will produce neither an acid nor alkaline reaction. A 7.0 reading on the pH scale means that there are an equal number of free hydrogen (acidic) ions and hydroxide (basic) ions. Nitrate   A natural nitrogen compound sometimes found in well or surface waters. In high concentrations, nitrates can be harmful to young infants. Nominal Filter Rating   Filter rating indicating the approximate size particle, the majority of which will not pass through the filter. It is generally interpreted as meaning that 85% of the particles of the size equal to the nominal filter rating will be retained by the filter. Non Degradable   Resistant to decomposition or decay by biological means such as bacteria action or by chemical means such as oxidation, heat, sunlight or solvents. Nonpathogenic   Not disease producing. Normal Flow Filtration   The flow of the entire feed water stream in one direction directly through the filter media. Not Detectable   A term used in reporting test results to mean that the substance being tested cannot be detected by the equipment or method being used for this particular test. This term implies that it is possible that trace amounts may be present in quantities to small to be detected by the test equipment or method. NTU   nephelometric turbidity unit. Nucleus   The positively charges central part of an atom containing nearly all of the atomic mass a consisting of protons and neutrons (except in hydrogen which consist of one proton only). Nutrients   Elements or compounds essential as raw materials for organism growth and development. Back to top