Just finished removing laminate flooring and three layers of old tiles from my kitchen concrete floor which is now back to it's original level.Only problem this leaves me with a strip (about 3.5 meters long) of concrete which is about 4mm proud of the new level.Concrete hides central heating pipes and I know (by checking) that the pipes are safely well below my new level.Had simlar but much smaller problem in other rooms but used cold chisel in these to level the strips of concrete on these floors.Does anyone have a solution other than many hours hard work with the chisel! I am wondering if there is such a thing as a concrete sander or similar?