ShuRex Replacement Fluoride Water Filter and Black Purification Elements, Compatible with Berkey and other Gravity Filtration System (Pack of 2 x white fluoride + 2 x Black Filters)

HIGH-EFFICIENCY FILTRATION: The Black Water Filters emoves contaminants such as inorganic minerals, heavy metals, silt, sediment, chlorine, sand, rust, odor and large particles in freshwater sources and improves the taste of water; The Fluoride Filters Made by premium activated carbon and activated alumina, and Effectively remove fluoride and arsenic and other residual typical heavy metal ions. PERFECT COMPATIBILITY: Compatible with the Travel, Light, Big, Royal, Imperial and Crown series of Gravity Filtration System EASY TO INSTALL: No tools needs. Use with Black filter element and fluoride filters will have better effect LONG-LASTING: We recommend you replace Fluoride Water Filters every 1,000 gallons, and Black filters every 3,000 gallons, under normal conditions. This filter is not made by original brand; the brand and model name are used for reference purposes only. However, it is really a good and value Cost-effective Black filters and fluoride filters . Buy with Confidence: For any reason you're not satisfied, let us know and we'll replace or refund for you. [**Attention**] When connecting the white fluoride element to the black filter element, if you screw it too tightly, it may cause the water to not flow out. We suggest you screwing 8 times, or screw back if it's too tight.