Manufacturing process The cast iron kettle also called TETSUBIN in Japan,The cast iron kettle is made by using the most primitive casting method, because the iron ion is chemically active. Therefore, most of the iron kettle have different levels of rust, patina and various kinds of pollutants; MilWorld has its own treatment to prevent rust, but after a long period of use, rust cleaning and finishing is absolutely necessary. Use and Maintenance ●1、When use the teapot at the first time, put 5-10 grams of tea into the iron teapot and brewing for about 10 minutes.Pour the water out after boiled. Repeat boiling in this way for 2-3 times. A tannin film will cover the inside of the teapot, which is the reaction of tannin from tea leaves and Fe2+ from iron teapot, it will protect the pot from rusting and remove the odor of new pot. ●2、Please keep the inside of the teapot dry after each use.Just take the lid off to evaporate the water inside.Then use soft cloth to wipe it. Name & capacity & weight ●Golden fish scales→30.4oz(900mL)→3.15 lb（1.43Kg) ●black fish scales→30.4oz(900mL)→3.15 lb（1.43Kg) ●goldfish→30.4oz(900mL)→3.15 lb（1.43Kg)●Silver goldfish→30.4oz(900mL)→3.15 lb（1.43Kg)Rust removal method●1、Alum rust removal: Pour 1 kg of water into the iron pot, add about 50 grams of alum, boil for 10 minutes, Then use a brush or a rag to wipe the rusty area repeatedly. ●2、Vinegar removes rust: vinegar is the most commonly used rust-removing item. The iron kettle is rusted. Just pour some vinegar in the kettle and add water to boil.As you are burning water ,you are brushing kettle.The rust can be removed quickly 。 Milworld hope that every customer can have a good time when you buy something in our store.