Kesselsteinlöser Pro= Limescale Remover Professional  Heavy Duty 
 
A highly acidic, phosphoric acid-based, liquid special cleaner for the quick and easy cleaning of untreated, bare aluminum and stainless steel surfaces.
lujoCLEAN Boiler Scale Remover PRO can be used on all acid- and solvent-resistant surfaces and is ideal for descaling acid-resistant boilers. It removes limescale, water scale, rust, and starch residue on its own.
Ideally suited for descaling siphons in toilets and urinals.
Depending on the degree of soiling and the thickness of the encrustations, apply a 1 to 3% solution, i.e., add 1 to 3 liters of Alke Special to 100 liters of hot water. For heavy limescale and water scale buildup, allow to soak for several hours and then rinse thoroughly with plenty of clean water. Repeat the process if necessary for extreme limescale deposits.
Can be diluted up to 300 :1
For 1ltr of water add 30ml for heavy limescale or 10ml for normal use.
 
WARNING:
CO2 may be released during the descaling process. Therefore, always ensure adequate ventilation!