Water treatment equipment, namely, water filtration units; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water; Water purification and filtration apparatus; Filter devices and filters for heating-, steam generation-, cooling-, drying-, venting-, water conveying, water treatment-, climate-, air conditioning- and sanitary installations and devices; spare parts for previously mentioned wares; Heat exchangers for the heat exchange between raw sewage wastewater and liquid and/or gaseous media; cooling and heating installations for media to that effect, including sewage to refrigerant exchanger; Heat pumps; Heaters and coolers for fluids; heat exchangers