DUAL BIG BLUE 4.5 X 20 FILTERS HOUSING WITH 1 NPT AND PRESSURE RELEASE. This poly filter housings are manufactured from the highest quality, FDA grade, 100% polypropylene. Leak-proof sealing is accomplished by compression against a top seated EPDM O-ring located in the housings sump. Thick wall and added ribs make the housings ideal for a wide range of applications. Polypropylene construction provides excellent chemical resistance in most installations environments. Large capacity housing suitable for high flow applications. Pressure relief on inlet side of cap. Accepts 4.5 diameter cartridges. Heavy-duty construction, made using high-quality FDA grade polypropylene. Superior chemical resistance from many aggressive chemicals. Buttress thread design for superior security. Thick side walls with heavy-duty ribs to provide greater strength. Temperature rated to 125°F (52°C). Cap, sump and top-seated O-rings compress to provide leak proof sealing. Filtration Stages: Filters are by LiquaGen Water. Please Note: Not cheap imported filters. Stage: 5 MICRON SEDIMENT FILTERS. Grade Polypropylene (PP) as material, the filter cartridge contains no wetting agents, solvents, antistatic agents or binders. The surface layer of the filter cartridge is designed to be low density to assure the high dirt-holding capability, while the inner layer is higher density to keep the accurate micron rate to stop small particles. Then density type is 30% higher filtration effect then the general type. Stage: 5 MICRON ACTIVATED CARBON BLOCK WATER FILTER CARTRIDGE. For Chlorine, taste, odor reduction. 100% Coconut shell carbon. Recommended flow (max) 8GPM. CERTIFIED AND TESTED UNDER ANSI STANDARD 42. When the Sediment Filter (Stage 1) starts tuning brown is an indicator that the filters need to be replaced. The Clear color housing makes it easier to see when the filters are turning brown. Personal checks may be held until cleared. The item “Whole House Big Blue Water Filtration System 20 Clear Commercial Filters 1 NPT” is in sale since Sunday, September 07, 2014. This item is in the category “Business & Industrial\Restaurant & Catering\Bar & Beverage Equipment\Water Filtration”. The seller is “waterproshop.usa” and is located in Cypress, California. This item can be shipped to United States.