Cleansui Pot-Type Water Purifier CP513 It appears to be a different cartridge version of the CP503 (see product page below). https://cleansui.com/products/cp503 An unused cartridge (not an alkaline cartridge) is included. --- I am selling this because I purchased a new, larger capacity model. I bought it in July of this year and used it for about 3 months. There are scratches from use. I couldn't photograph the scratches well due to the lighting, but I will try again if you'd like. --- Product Description: Filtered water capacity: 1.1L, Total capacity: 1.7L * Filters 200L with one water filter cartridge (Replacement guideline: 3 months *when using 2L per day) * Number of substances removed: 17 + 3 * Easy-to-handle compact model (filtered water capacity 1.1L, total capacity 1.7L) * Easy-to-wash round form * Sleek design that fits on the dining table * Recommended for use with CP508, dedicated to cold drinking water.