a closed room r condensers and similar construction elements containing noxious particles will be eliminate by hand or mechanically in a follow up step all ferro magnetic particles fe are sorted out by magnetic sorting machinery m s remaining material after having been cleared from noxious and iron components and in an intermediate step being manually or mechanically cleared from bulky and voluminous construction components is taken to a comminuting installation as shredders hammer mills and similar equipment for further comminution to very small particles since they only can difficultly be cut to pieces the conglomerate thus obtained is treated in a first flotation installation k s that operates with a flotation liquid of pure water that is kept under motion by a pulsation generating equipment p this process step is for separating particles of the conglomerate that are heavier than plastics the heavier particles gs settle in the flotation basin k s on a jerkily reciprocating perforated bottom sb that moves slowly in one direction and accelerated in the counter direction stopping jerkily this way of motion generates in the heavy material settled a kinetic energy that transports it towards an opening in the perforated bottom sb to an exit through which the material may fall into a container ab for being taken to follow up installations for further treatment after the separation of plastics and other stuff being heavier than plastics procedural steps differ from one another and follow two branches one of these branches deals with further treatment of plastics and the other one with further treatment of other stuff which is heavier than plastics the branch which handles a continuation treatment for plastics comprises at least a further flotation step k d at which a separation.