The range of products includes everything necessary to the formation of a column shaft tubes, spiral filters , filters, bridge , filters through all the pieces of the joint ( such as collars , flanges, reduced flanges with cable , fillets ), and particular pieces such as wellheads , centralizers , end caps ( caps), dielectric joints , cones reduction . Pipes and filters through the bridge and are made from steel sheet with thickness from 3 to 10 mm. This type of processing allows the production of each diameter so as to satisfy all the requests from a minimum diameter of 114 mm . All articles can be made : carbon steel (FE 37 - FE52 ) that can be left blank ( black then rolling ) or painted / bitumen or galvanized and in any type of stainless steel according to the end ( 304 , 304L , 316, 316L , 1.4462 , 430 etc) . The raw material supplied by European manufacturers , where necessary and required may be accompanied by certificates of chemical analysis and mechanical . The choice of the material of the column shaft (pipes and filters) is carried out exactly according to the intended use of the well ( drinking water, irrigation, desalination , spas , wells dispersants, industry , research, etc. ) to the geology and stratigraphy , the operating conditions of the drilling , aggressive water chemistry and corrosion phenomena (eg, very often caused by stray currents ) . The added value of the production of wire that allows to obtain trapezoids / triangles of any size and therefore suitable to build filters spiral that can withstand resistance to crushing and tensile avoiding , as far as possible , the use of filters with backbone . These are recommended for installation at depths in soils with particular characteristics which are preferable to the filter coil and if so requested specifications .