Citric Acid Descaler Sachets 0.3 oz (10 Grams) in Packs of 10, 20 & 40 (20) Foil Fresh, Batch Numbered, Factory Produced Citric Acid Sachets. Just one-two 10 gram sachets will make your Sterilizer/Kettle as good as new. It is an ideal natural way to descale baby sterilizers. Descales kettles, coffee makers, humidifiers, sinks, showers, taps and ceramic tiles Also used on bottle warmers and many other household appliances.