the ionic solution be inserted through a tube 38 which is inserted into bore hole 34 tube 38 can be polyvinyl chloride polyethylene or other plastic tubular members the precise material of which tube 38 is constructed is not important the important factor is that tube 38 effectively insulate the interior wall of bore 34 from contact with the highly ionic inorganic salt solution except for at the bottom suitable highly inorganic salt solutions can be found in group ii and group iii metal salt solutions such as calcium chloride barium chloride stronchim chloride aluminum chloride as well as others it is preferred that the salt be highly water soluble salt of at least divalent metal the most preferred salts are calcium chloride salts and aluminum chloride salts because of ease of availability and economic considerations the concentration of the salt solution is not critical but the important criteria is that it freely disassociate into a highly ionic form with the more free ions available being the best concentration of the solution is not critical except that very weak concentrations are unsatisfactory most satisfactory concentrations are those providing the most free ions therefore the more near that the solution approaches saturation the more free ions are available and therefore the more preferred is the solution experience has proven that most satisfactory results are achieved when the inorganic salt solution is one which has a molar concentration equal to at least 50 of saturation in this first step the tube 38 is inserted into bore hole 34 and the highly ionic inorganic salt solution is poured into the interior of tube 38 the solution gravitationally flows down tube 38 into the bottom of bore hole 34 and saturates the surrounding soil adjacent tile.