a heated solution could be utilized if other components were added to produce different visual effects on the fabric so treated the porous abrasive elements which are to be impregnated with the reactive solution are loaded in the mesh basket at a site and the basket is elevated and placed within the vessel 11 so as to rest upon stand 41 the cover lid 14 is then rotated and lowered into position and locked to provide a pressure tight vessel at this time the pressure within the vessel is equal to the atmospheric pressure to initiate the operation the operator activates motor 35 and vacuum pump 18 to lower the pressure in air tank 34 as shown the air tank is coupled through a valve 50 which is open to reduce the pressure in vessel 11 to a level below that of the ambient pressure this pressure drop is within the range of 12 14 pounds per square inch below atmospheric pressure and upon reaching this reduced pressure level valve 23 is opened and pump 19 actuated to supply the reactive solution to vessel 11 the vacuum pump 18 maintains the desired pressure level in tank 34 so that the evacuation through port 10 in cover 14 continues during the introduction of the reactive solution this permits the reduced pressure to be maintained during filling of the vessel 11 filling continues until the reactive solution level reaches the level sensor 27 which then closes valve 23 connected in the feed line through input port 21 to vessel 11 the wire basket 40 is filled with porous elements to a level that does not exceed the liquid level established by sensor 27 as.