Berta Adv Electro-sponge 110V50Hz120WBerta Adv 110V50Hz Electro sponge for cleaning cement based and epoxy grout from floors. No more kneeing with this machine the sponge roller is cleaned by the rotating belt and can grout 100 meters per hour. The sponge roller can grout between 150 to 2000 meters depending on the surface texture. A very easy machine to use come fitted with a brown sponge roller (Havana) that is quick to replace with the magnetic clutch. There is a full range of sponges