spool type expansion joint used for connecting adjacent sections of piping a valve 177 is preferably provided for shutting off fluid flow through pipe 175 a plurality of individual fluid distributors preferably in the form of fluid distributing elongated flexible tubes 176 are individually coupled to the central pipe 175 of each module 100 the flexible tubes 176 may distribute fluid therefrom in any of a variety of ways the tubes 176 may be porous or perforated with holes arranged in any manner such as linearly randomly or in regular patterns or the tubes may include spaced apart discrete distributing elements such as water emitting fittings or sprinklers in the preferred embodiment the fluid distributors comprise lengths of flexible tube 176 coupled at one end to central pipe 175 and closed at a remote end and having a series of perforations formed along the length for simplicity the fluid distributors will be referred to hereinafter as 34 hoses 34 or 34 perforated hoses 34 the hoses 176 are deployed behind the apparatus 50 in a side by side generally parallel arrangement and fluid flows through each of the hoses 176 and through the perforations thereof so as to be distributed over the leach field for percolating through the ore the hoses 176 may be rolled up onto the reel assembly 170 to transport the hoses from one location on the leach field to another a flow rate sensitive shut off valve is preferably provided between the main pipes 38 40 and the apparatus 50 to shut off.