Filtration Glossary
Clear, concise definitions of the key terms in high-flow liquid filtration — from absolute filtration to condensate polishing.
226 O-Ring Interface
A common cartridge end-cap connection using dual 226-code O-rings with a locating fin or bayonet, sealing the element into the housing tube sheet.
Read definition6-Inch Filter Housing
The predominant high-flow housing standard, accepting elements of roughly 6.0" (152 mm) outer diameter across most major OEM platforms.
Read definitionAbsolute Filtration
A filtration rating stating that a defined percentage — typically 99.9 % (beta 1000) — of particles at or above the rated micron size is removed in a single pass.
Read definitionBeta Ratio (β)
A dimensionless number expressing filtration efficiency: the ratio of particles of a given size upstream to those downstream of the filter.
Read definitionChemical Compatibility
The suitability of a filter’s media and seal materials for the fluid being filtered, over the operating temperature and pressure range.
Read definitionCondensate Polishing
The fine filtration of steam condensate to remove corrosion products (mainly iron oxides) before the water returns to the boiler.
Read definitionDirt-Holding Capacity
The total mass of contaminant a filter element can retain before reaching its change-out differential pressure.
Read definitionEnd Cap (DOE / SOE)
The molded or welded cap that seals each end of a filter element and defines how it interfaces with the housing.
Read definitionFilter Change Interval
The recommended service period after which a filter element should be replaced, driven primarily by differential pressure rather than time alone.
Read definitionFlow Rate
The volume of liquid passing through a filter per unit time, usually expressed in m³/h or gpm, and a primary driver of element sizing.
Read definitionGlass Fiber (GF) Filter Media
A high-efficiency, absolute-rated pleated medium made from fine borosilicate glass microfibers, used for demanding fine filtration.
Read definitionHigh-Flow Filter
A large-format filter element designed to process very high liquid flow rates through a single cartridge, reducing the number of elements, housing size, and change-out labor compared with standard cartridges.
Read definitionMDEA / Amine Filtration
The filtration of amine solutions (such as MDEA) used in gas sweetening to remove acid gases like H₂S and CO₂.
Read definitionMeltblown Media
A depth-filtration medium formed by blowing molten polymer into fine, randomly layered microfibers that trap particles throughout the media thickness.
Read definitionMicron Rating
The nominal particle size, in micrometers (µm), that a filter is designed to remove — stated as either an absolute or a nominal value.
Read definitionNominal Filtration
A filtration rating indicating an approximate particle-removal efficiency — commonly 50–90 % — at the stated micron size, without a guaranteed single-pass value.
Read definitionOEM Replacement Filter
A filter element manufactured to fit and perform equivalently to an original equipment manufacturer’s part, without being the OEM brand.
Read definitionOutside-to-Inside Flow
A flow configuration in which liquid enters the outer surface of the element and exits through the core, using the full pleat area for filtration.
Read definitionPleated Filter Element
A filter whose media is folded into pleats to pack a large surface area into a compact element, lowering pressure drop and extending life.
Read definitionPolypropylene (PP) Filter Media
A thermoplastic filter medium prized for broad chemical compatibility, low cost and freedom from binders or additives.
Read definitionPressure Drop / Differential Pressure (ΔP)
The difference in pressure between the inlet and outlet of a filter, indicating flow resistance and the degree of media loading.
Read definitionSDI (Silt Density Index)
A standardized measure of the fouling potential of water, widely used to protect reverse-osmosis and membrane systems.
Read definitionVerified Fit
An R+F designation confirming that a replacement element has been matched to the OEM part on dimensions, media, and end-cap/seal interface.
Read definitionViton / FKM Seal
A fluoroelastomer O-ring or gasket material offering excellent resistance to oils, fuels, solvents and high temperatures.
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