100% Genuine,Made In England Doulton Super Carb grades which combine the advantages of ceramic and carbon treatment within a single filter element. Dimension : These Doulton Super Carb Ceramic Filter candles are manufactured to a diameter of 2 inches/50mm and are available in standard lengths-10 inches/254mm. Short Mount Size : Doulton Super Carb candles are manufactured with 19mm. Quality Control : All Genuine Doulton ceramic filter candles are manufactured in accordance with ISO 9001:2008 quality assurance procedures which ensures highly consistent product quality with full batch traceability in operation. Independent quality control approval such as the NSF International standard 42 and 53,and WARS approval ensures the product performance claims are verified to the highest level. Specially designed for royal use in England,this England-made filter with 0.2-0.5 micron hole diameter can efficiently filter out any matter with the diameter larger than its hole diameter including bacteria,slit,suspension in water,cystobacter,pathogen,and virus.