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Fellow recommends citric acid descaling for its kettles. This is that chemistry, in a clear unscented concentrate, at a bottle size that lasts.
Three ingredients — citric acid, sodium citrate, water. No fragrance and no dye, which matters when the thing you are descaling is the kettle you brew filter coffee with. One tablespoon per descale, 15 descales per 8 fl oz bottle.
Please note the following important information about this product from Think Crucial: (i) it is an independent third-party product, NOT an Original Equipment Manufacturer (OEM) product from Fellow®, Stagg EKG®, Corvo®, Clyde®, Aiden® or any other brand named on this page; (ii) because it is not an OEM product, it is not covered by any guarantee or warranty from those manufacturers; (iii) use of this product may violate or void a manufacturer's guarantee or warranty - it is entirely your responsibility to check, and entirely your risk if you decide to use this product; (iv) we do not guarantee or warrant compatibility with any product from those manufacturers. Please check your manufacturer's warranty with regard to the use of non-OEM products. All brand names and trademarks referenced belong to their respective owners and are used here only to explain the compatibility of this independent product. Always follow your appliance manufacturer's own cleaning and descaling instructions.