The catalyst is a preparation for removing soot from chimneys and flues. It also improves the economy of operation of stoves and boilers. The use of a catalyst has a preventive effect against fires caused by the ignition of soot in flue pipes. The purification principle consists in a catalytic reaction by which the settled carbon black is converted into carbon dioxide. It is a flame-free combustion process at a lower temperature than conventional combustion. The recommended dosage for local heaters, fireplace stoves, boilers for floor heating is 1 bag, for central heating boilers 2 bags. It is not recommended to use a larger dose at once. In case of heavy soiling, repeat the cleaning procedure. Use: Put the bag on the hot fuel and close the heater to prevent the active substance from escaping into the environment. This would reduce the cleaning effect and could release unpleasant smoke or an odor in the room. Package weight is 1 kg.