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How long does it take to clean a tank or cistern?

Removing the bottom set is very difficult to assess and give a general answer, on the other hand, washing is much easier. Normal washing of the entire tank or cistern where the tank has a maximum diameter of 30m with a spherical washing robot takes about 6h-18h depending on the previous media in the tank. This time consumption is calculated on washing time with the system and not establishment or connection work.