NOVELTY - The apparatus for delivery of a remediation composition into a waste stream comprises a reservoir for a liquid, a dispensing element having a hollow cylindrical tubular body defining an interior cavity with a volume, and a wall with an inner surface and an outer surface. The cylindrical tubular body comprises one or two open ends. A portion of the wall is porous and has a pore size and total pore volume that renders the wall pervious to a liquid-borne composition, which is impervious to solid retents.    USE - The dispensing apparatus is useful for delivery of a remediation composition into a waste stream. The apparatus is useful for delivering predetermined and measured quantities of treatment agents having microorganisms to a wastewater stream continuously over time.    ADVANTAGE - The dispensing apparatus is capable of generating and maintaining a controlled release of concentrated a remediation composition throughout the delivery cycle, cost effective and simple in construction and user friendly for the remediation or bioremediation of wastewater, and easily customized to address specific requirements for a given wastewater stream. The apparatus provides compositions of remediation agents conveniently formulated for specific applications of retention, activation and release profiles that optimize the remediation effectiveness, and dispenses the treatment agents without the need for external power or electrical interface.    DETAILED DESCRIPTION - The apparatus for delivery of a remediation composition into a waste stream comprises a reservoir for a liquid, a dispensing element having a hollow cylindrical tubular body defining an interior cavity with a volume, and a wall with an inner surface and an outer surface. The cylindrical tubular body comprises one or two open ends. A portion of the wall is porous and has a pore size and total pore volume that renders the wall pervious to a liquid-borne composition, which is impervious to solid retents. The dispensing element is positioned such that the porous portion of the wall is disposed within the reservoir. The dispensing element is fixedly disposed within one or more openings in the reservoir such that a liquid-borne composition within the reservoir can pass through the porous portion of the wall to the outside of the reservoir. The apparatus is oriented such that a liquid borne composition from within the reservoir is dispensed by gravity into a waste stream over time. The porous portion of the wall has a pore size of 10-100 microns. The open ends are open distal end and closed proximal end. The wall at the closed proximal end is porous. The outer surface of the closed proximal end is a convex surface. The convex surface of the closed proximal end is essentially hemispherical. The ratio of the volume of the interior cavity to the total pore volume of the wall is 0.5. A combination of the hollow cylindrical tubular body and contour of the outer surface of the dispensing element render the dispensing element self cleaning during use. The open distal end of the dispensing element comprises a connecting unit which functions to sealably fix the dispensing element within the opening. The connecting unit functions permit the attachment of a conduit to direct liquid borne compositions into the waste stream. The connecting unit is a screw thread. A retainer nut is mated to the screw thread. The hollow cylindrical tubular body of the dispensing element has two open ends. The dispensing element is shaped in the form of an arc. The dispensing element is positioned such that the cylindrical tubular body is disposed within the reservoir. The two open ends are fixedly disposed within one or more openings. The arc is essentially a 180degrees arc. The dispensing element comprises metals, ceramics, glasses and/or polymers. The reservoir is a rigid, semi-flexible pouch, collapsible vessel. A covering encases the collapsible vessel. The covering is provided with opening to accommodate the dispensing element. The covering comprises corrugated fiberboard. The flexible pouch comprises one or more flow-limiting restrictions having a seam extending partially across the pouch effectively dividing the pouch into two sections while permitting fluid communication between liquids in the two sections. The flexible pouch contains solid remediation agent disposed in a space between the one or more flow-limiting restrictions and the dispensing element. The flexible pouch comprises a means for attachment to an external support. The reservoir contains remediation agent that is partially soluble, dispersable or emulsifiable in water. The reservoir contains remediation agent that is bioactive or bioactivatable. The solid immobilizing medium comprises a fibrous web, mesh, batting or mat. The reservoir contains remediation agent sealed within a water dispersible or water-soluble packet. An INDEPENDENT CLAIM is included for a method for remediation of a waste stream.    DESCRIPTION OF DRAWING(S) - The diagram shows an assembled apparatus positioned to deliver a remediation composition into a drain.    Flexible delivery conduit (2)    Drain (3)    Outer housing (4)    Reservoir (6)    Dried remediation composition. (7)