Specification Brand : Watts BulletPoint1 : 6 AUTHENTIC BLACK BERKEY ELEMENTS BB9-2 REPLACEMENT ELEMENTS FOR BERKEY GRAVITY-FED WATER FILTER SYSTEMS- Black Berkey Elements can be used with Big Berkey, Berkey Light, Crown Berkey, Imperial Berkey, Royal Berkey, Go Berkey and Travel Berkey Systems. BulletPoint2 : INDEPENDENT TESTING- Black Berkey Elements (the original BB9-2) are composed of a unique, proprietary blend of multiple media types backed by testing from accredited, third-party labs. Black Berkey Elements remove or dramatically reduce over 250+ typical contaminants that could be present in freshwater sources—no electricity, tools, or plumbing are required. BulletPoint3 : INCLUDES AUTHENTIC BLACK BERKEY ELEMENTS (THE ORIGINAL BB9-2)- Don't fall for lookalike filters that use our Berkey BB9-2 model number or trademarks in their titles or product descriptions to legitimize their brand as replacements or "compatible", when they are not. Black Berkey Elements are designed to work synergistically and target specific contaminants that far exceed the reduction capabilities of black filters solely composed of activated carbon. BulletPoint4 : ECONOMICAL, LONG-LASTING- Black Berkey Elements provide filtered water for just pennies per gallon. Each pair of Black Berkey Elements lasts for up to 6,000 gallons before replacement is recommended. Elements may require replacement sooner based upon the quality of influent water. BulletPoint5 : THE GOLD STANDARD IN GRAVITY-FED WATER FILTRATION- Authentic Black Berkey Elements are capable of greater contaminant reduction and a longer lifespan than virtually any of the other filter elements on the market. Capacity : 20000 gallons Color : Blue CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier : 6922350630161 ExternallyAssignedProductIdentifier1 : 700999868864 ExternallyAssignedProductIdentifier2 : 0700999868864 ExternalTestingCertification : Black Berkey formulation tested by accredited third-party labs IncludedComponents : 6 Black Berkey Elements InstallationType : Under Sink ItemName : Watts WQC4RO11-50 Kwik-Change RO Replacement Filter Annual Bundle With Membrane ItemPackageDimensions_Height : 35.56 centimeters ItemPackageDimensions_Length : 6.604 centimeters ItemPackageDimensions_Width : 33.02 centimeters ItemPackageQuantity : 3 ItemTypeKeyword : replacement-undersink-water-filtration-filters LowerTemperatureRating : 50 degrees_fahrenheit Manufacturer : Ronaqua Material : Polypropylene (PP) MaximumFlowRate : 20 gallons_per_minute ModelName : RA-124-10 ModelNumber : WQC4RO11 50 NumberOfItems : 1 PartNumber : B007I75WTW PowerSourceType : Manual Operation ProductBenefit : Water filtration ProductDescription : Watts WQC4RO11-50 Kwik-Change RO Replacement Filter Annual Bundle With Membrane ProductSiteLaunchDate : 2014-09-10T04:52:05.378Z PurificationMethod : Sedimentation Size : 6 Count (Pack of 1) SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 40161500 UpperTemperatureRating : 125 degrees_fahrenheit