Tetsuka Specifications Material: Iron Casting; Capacity: 0.8 L; Compatible Heat Source: Direct fire (under medium heat); Electric Stove. Hot water springs from tetsubins have a mellow taste and is effective for iron supplements; Material: Cast iron; Infuser: Stainless steel; Capacity: 0.3 gal (0.8 L); Compatible with gas and electric stove, charcoal fire, induction cooker. Not dishwasher safe. Mellow and delicious. It is often found because the iron is released, the taste of the water becomes softer, and the karuki absorbs the inside of the tetsu. Tetsukiru is not only tea, but also makes coffee and tea delicious. Red rust is normal: However, if used for a long time, red rust will always be produced. Wash with detergent and scrub Do not scrub it with such this, it will damage the inner coating of the tetsub. Iron Supplement: Boil white water containing iron, so it is perfect for iron supplementing if you suffer from anemia. When boiling water, it releases divalent iron that is easily absorbed by the body and blends in with water or tea, making it effective for iron supplement.