Keep your gravity-fed water filter system in top condition with this Coldstream Ceramic FTO Plus Replacement Filter 2 Pack. Manufactured in the UK, these premium ceramic filters are compatible with gravity systems like Berkey, Osmio, Coldstream, and other similar models. The FTO Plus filters combine advanced ceramic filtration with activated carbon to effectively remove chlorine, bacteria, cysts, heavy metals, pesticides, and microplastics, while retaining essential minerals for great-tasting, healthy drinking water. The best gravity filter on the market today Compatible with Doulton British Berkefeld and Big Berkey Housings Reduces sodium fluoride to high levels 97% without any additional filters The best buy of all and MADE IN THE UK 2.5" diameter by 10" length for superior filtration and faster flow rates Average pore diameter - 1 micronThe powerful ceramic gravity filter dual pack (CF163W-2) is compatible with all of the Doulton (British Berkefeld) and Big Berkey (and larger sizes) filter housings and makes a fantastic upgrade option as the filters have fantastic performance, particularly with regard to fluoride, hormone and pharmaceutical reduction in water.NSF 42 Certified - which guarantees materials are not extracted at all into the filtered water. Performance Bacteria removal (E.coli / Cholera / Shigella / Typhoid / Klebsiella Terrigena) - 99.9999% Cyst removal (Cryptosporidium / Giardia) - 99.9999% Volatile Organic Contaminants – 94% - 99% Lead, Cadmium, Selenium, Zinc removal – 100% Heavy Metal Contaminants (to NSF 53c) – 97% Pesticide Contaminants – 99.9% Herbicide Contaminants – 99.9% Free Chlorine Removal (Chlorine Taste and Odour) – 99.9% Chloromine Removal – 99.9% Fluoride removal – 97.0% Flow Rate – 1.0 L/hr Operating Temperature - min 5°C / max 30°C Service Life - 6 months (recommended) Filter Critical Dimensions• Diameter – 2.9”• Length – 8.0”• Fitting type – ¼” BSP• Fitting length – LM (26mm)