Basics of Filtration

Parameter	Surface Filters	Depth Filters
Deformable Particles	May blind off pleats	Recommended - adsorptive retention
Non deformable Particles	Removes narrow range	Removes broader range of particles
Rating	Absolute or nominal	Absolute or nominal
Classification/Clarification	Classification	Clarification
Flow per 10" Equivalent PSID	Recommended 10 gpm	Recommended 5 gpm
Economic - Particle Retention < 10 Micron	Holds more dirt than depth, handles higher flow rate	More economical than pleated at greater than 10 microns
Cartridge Cost *	More expensive initially than depth, fewer replacements, holds more dirt	More economical initially than pleated, holds less dirt
Housing Cost *	Fewer cartridges - smaller housing	More cartridges-bigger housing

*Based strictly on cartridge purchase, pleated cartridges cost more per 10" equivalent. If a new system is being designed, a larger housing will be necessary for depth cartridges, as opposed to pleated cartridges, to achieve the same flow at a given pressure drop and micron rating.

Type of Cartridge	Description	Benefits	Typical Application*
Yarn Wound (Depth)	Yarn of twisted staple fibers wound around a center core.	Inexpensive, broad chemical compatibility, numerous material options for many applications.	Chemicals, magnetic coatings, cosmetics, oil production, food and beverage, potable water photographic applications.
Non-Woven (Depth)	Depth media created by layering melt-blown (extruded) fibers.	Graded pore structure, chemically inert materials, no extractable downstream.	Photo chemical, potable water, solvent, ultra pure water, chemicals, beer and wine, food and beverage, enzymes, resins.
Non-Woven Pleated (Surface)	Pleated media: spun bonded or melt-blown sheets; paper-like.	Wide chemical compatibility, large surface area per 10" cartridge, high dirt-holding capacity, cheaper than depth cartridges at low microns.	DI water, process water, electronics, wine filtration, photographic applications, magnetic coatings, chemicals, cosmetics.
Membrane	Polymeric sheets containing symmetric or asymmetric pores (RO membranes and most UF membranes don't have pores).	Asymmetric pores, positive mechanical retention, high flow rate, absolute ratings, resistance to bacteria, ultra-fine filtration.	DI water applications, electronics, plating, chemical process, power generation, photographic applications, food and beverage, various etch baths.
Resin-Bonded	Fibers treated with resin to enhance rigidity.	Rigid for high viscosity, no center core, no glues or epoxies, little media migration, one piece construction, high flow rates.	Paints, inks, coatings, adhesives, oils, sealants, resins, petroleum, pesticides, salts water, varnishes.
Sintered Metal	Porous media formed by sintering thin layer of metal.	Absolute rating, strength, porosity, cleanability, high flow and dirt-holding capacity, non-fiber releasing.	High temperature, high pressure applications; corrosive fluids, polymer filtration, process steam, gas filtration, catalyst recovery.
Woven Metal	Fibrous media woven into distinct pattern,	Strength, cleanability, high flow, porosity, dirt-holding capacity.	Same as Dynalloy but at much large micron ratings. Used more as a sieve.
Granular	Porous carbon activated to develop large surface area.	Removes dissolved organics from gases and liquids.	Potable water, reverse osmosis, organics removal, instrument



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Liquid Filtration

	Filter Housings
	Filter Cartridges
	Filter Bags
	Filter Strainers

Air/gas Filtration

	Filter Housings
	Filter Elements

Hydraulic Filters

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