Keystone Filter manufactures a wide range of air, liquid, and gas filtration products for industrial, commercial and residential markets. These industrial filter products include industrial liquid and home drinking water filters, filter housings and replacement filter cartridges. Filter cartridges are available in a wide range of media including polypropylene, microfiberglass, cellulose and activated carbon. Standard, giant and bag housings are offered in a variety of materials including blue polypro, clear SAN, reinforced nylon and stainless steel. Keystone Filter is also one of the premier custom pleaters and custom filter cartridge manufacturers in the United States.
Standard Industrial Filter Cartridges
Polypropylene Filters with Polypro End Caps
These replacement filter cartridges feature the latest technology in filter media. Layers of melt-blown and spun-bonded polypropylenes combine to produce nominal retentions from 0.1 micron to 30 micron. Polypropylene filters feature popular end cap styles which fit most standard and sanitary style housings. Ideal as low cost membrane prefilters, these high efficiency filter cartridges serve a wide range of applications.
Polypropylene Filters with PVC End Caps
These polypropylene replacement filter cartridges feature the same high quality filter media as the all polypropylene series filters combined with self-gasketing FDA grade PVC endcaps. Typical applications for these economical filter cartridges include food and beverage, water purification, bottled water and cosmetics.
Microfiberglass Filters with Polypro End Caps
These filter cartridges are designed to provide the most economical solution for a wide range of filtration problems. State of the art microfiberglass is layered with spun bonded polyester to produce highly efficient particulate removal with extremely low pressure drops. The pleated construction allows greater surface area than depth type cartridges which translates directly into longer life.
Microfiberglass Filters with PVC End Caps
These filter cartridges are designed to provide the most economical solution for a wide range of filtration problems. State of the art microfiberglass filters are layered with spun bonded polyester to produce highly efficient particulate removal with extremely low pressure drops. The pleated construction allows greater surface area than depth type cartridges which translates directly into longer life.
Giant Industrial Filter Cartridges and Bags
Polypropylene Filters with PVC End Caps
These polypropylene filter cartridges feature high quality polypropylene filter media combined with self-gasketing FDA grade PVC endcaps. Typical applications for these economical filter cartridges include food and beverage, water purification, bottled water and cosmetics.
High Performance Cellulose Filter Cartridges with PVC End Caps
Pleated phenolic impregnated cellulose cartridges for industrial applications.
Features include:
- High flow rate, high dirt holding capacity and low pressure drop create optimal system operation
- Cellulose media supported by polypropylene components
- Three removal ratings
- Pleated configuration
- Compatible with a wide range of industrial fluids
Polyester Filter Cartridges with PVC End Caps
Pleated phenolic impregnated polyester cartridges for industrial applications.
Features include:
- High flow rate, high dirt holding capacity and low pressure drop create optimal system operation
- Polyester media supported by polypropylene components
- Two removal ratings
- Pleated configuration
- Compatible with a wide range of industrial fluids
Economy Cellulose Filter Cartridges with PVC End Caps
These low cost, high quality filter cartridges feature tough, resin impregnated cellulose that is pleated to provide high dirt holding capability. Self-gasketing PVC end caps and polypropylene support components are featured in these economical cartridges that are suited to a wide range of industrial process fluid applications.
Wound or Carbon Briquette Filter Cartridges
Two different designs offer a choice in carbon filtration. The three micron nominal convolutely wound cartridge features more finely divided carbon secured in a fibrous matrix for greater adsorptive efficiency at a low cost. The ten micron granular carbon cartridge features over eight ounces of highly activated carbon providing longer life and high efficiency in the removal of unpleasant tastes and odors and chemical contaminants.
Activated Carbon Block Filter Cartridges
Carbon block filter cartridges provide extended life while removing sediment, chlorine, taste, odor, and organic contaminants from water, aqueous solutions or suspensions and many organic solvents.
Blue Giant Series
Blue Giant carbon block filter cartridges flow in the radial (outside-to-inside) direction, providing increased flow at lower pressure drop than conventional granular activated carbon (g.a.c.) filters. These cartridges will not channel or bypass due to the extreme uniformity of their extruded carbon core and can be installed without prefiltration because of their high dirt holding capacity.
Giant Polypropylene and Polyester Bag Filters
Keystone’s exclusive line of bag filters for our Giant housings have a unique seal ring that ensures the most efficient means of bag filtration. All bags are 100% polypropylene or polyester with plastisol (PVC) seal ring and are available in micron ratings from 1 to 200. Polyester bags are recommended for hot water/high pressure applications.
Keystone bags are available in the compact 10" length – very adaptable to side stream testing applications – and the more versatile 20" double length. Other bags may also be used in our housings.
Giant Economy Polypropylene and Polyester Bag Filters
Keystone also offers giant economy bag filters with a conventional metal ring seal. These bags are a low cost alternative to our standard bags and are suitable for applications where PVC (Plastisol) seals cannot be used and/or where a conventional steel ring provides a sufficient seal for your process.
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