NSF ANSI 330:2019 pdf download.Glossary of Drinking Water Treatment Unit Terminology.
Definitions covered by this Standard consist of terminology related to drinking water treatment units including terms describing materials, design, construction, and performance testing. NSF ANSI 330 includes definitions of terms used in NSF Drinking Water Treatment Unit Standards.
2 Normative references
The following documents contain provisions that, through reference, constitute provisions of this Standard. At the time this Standard was balloted, the editions listed below were valid. All documents are subject to revision and the most recent published edition of the document shall be used for undated references.
NSF/ANSI 42, Drinking Water Treatment Units — Aesthetic Effects.
NSF/ANSI 44, Residential Cation Exchange Water Sotteners.
NSF/ANSI 53, Drinking Water Treatment Units — Health Effects.
NSF/ANSI 55, Ultraviolet Microbiological Water Treatment Systems.
NSF/ANSI 58, Reverse Osmosis Drinking Water Treatment Systems.
NSF/ANSI/CAN 61, Drinking Water System Components — Health Effects.
NSF/ANSI 62, Drinking Water Distillation Systems.
3 Definitions
3.1 absorption: The penetration of one substance into another substance.
3.2 accessible: Fabricated to be exposed for cleaning and inspection using simple tools (e.g., screwdriver, pliers, open-end wrench).
3.2.1 readily accessible: Fabricated to be exposed for cleaning and inspection without the use of tools.
3.3 active agent: A substance or medium added to or involved in a drinking water treatment process that requires direct or sacrificial release of the agent or its degradation product(s) to perform a specific functions.
3.4 additive: A substance added to water, directly or indirectly, during a drinking water treatment process.
3.5 adsorption: The physical process occurring when liquids, gases, or dissolved or suspended matter adhere to the surface of or in the pores of a medium.
3.6 aesthetic: Pertaining to non-health-related factors that affect the acceptance of drinking water, such as taste, odor, color, and appearance.
3.7 air gap: A dedicated vertical air space designed to prevent the reverse flow of contaminated water into a potable water source (minimum of two pipe diameters or 25 mm [1 in] above the flood rim of the tank, whichever is larger).
3.8 alarm set point: See UV light disinfection.
3.9 ambient temperature: The temperature of a medium such as air, gas, or a liquid that surrounds items such as equipment, devices, instruments, and food.
3.10 anion: An atom or molecule that carries a negative charge.
3.11 back flush: The reversal of flow through a filter or ion exchange column to remove particles for cleaning purposes.
3.12 backwash: A reversed flow of water through a media which allows the expelling of collected matter to the drain.
3.13 bacteriostasis: An action or process designed to limit the growth of heterotrophic bacteria on the treatment media or in the unit so that the heterotrophic plate count of the product water is not larger than that of the influent water.
3.14 batch treatment: A method in which a fixed quantity of water is processed through a treatment device in a single treatment cycle.
3.15 bed volume: Total volume of the media including the void spaces between the media particles.
3.16 blackwaste: See UVlight disinfection.
3.17 breakthrough: The point (measured as volume of water or time) in the test of a water treatment system when the concentration of a contaminant in the product water exceeds the limit established in the standard.
3.18 brine: See salt.NSF ANSI 330 pdf download.