reuse of the brine solution preserves natural resources as well as achieves an economic advantage with reference now to fig3 there is shown another embodiment of the enclosed floor track system according to the present invention this embodiment also includes a wheel channel 44 for generally enclosing the wheel structure of a hand truck and thereby segregating such wheel structure from the environment of the fluid treatment chamber 10 the wheel chamber 44 includes a bottom portion 48 and also upwardly extending identically structured sidewalls 66 and 68 the wheel channel 44 is somewhat wider than the width of a hand truck wheel at its bottom 48 and then angles upwardly a short distance and then again vertically to form the sidewalls the narrow track bottom 48 along with angled parts 70 form a wheel guide which maintains the hand truck wheels generally centered on the bottom of the track channel the tendency of the wheels of a hand truck is to roll along the channel bottom 48 rather than climb the angled part 70 of the sidewalls the illustrated hand truck of fig3 is of the type having a depending i beam strut connecting the wheel section to the hand truck frame 74 the sidewalls 66 and 68 extend upwardly a distance such that the longitudinal edges thereof are proximate the center of the i beam 72 the sidewall upper.