NOVELTY - A solid dissolver system (10) comprises housing (12) having cover (14); a cartridge (18) containing agents for treatment of waste material; water inlet (22) that terminates at spray unit; and a water outlet (26) for channeling the effluent into waste water collection system. The cartridge comprises inner core (34) comprising first water-soluble material, inner agent, and outer portion comprising outer agent distributed in binder matrix of second water-soluble material. The inner or outer agent is oxygen generating materials, enzymes, bacteria, nutrients, and/or flocculants.    USE - Solid dissolver system used for treatment of waste material in waste water collection system, which is drain field, lift station, manhole inlet, drain, waste water stream, waste water sewer line, waste water pond, or grease trap (all claimed).    ADVANTAGE - Because the inner core is exposed along the surface of the cartridge, and the first water-soluble material of the inner core has greater water solubility than the second water-soluble material of the outer portion, the inner core is more readily dissolved such that a concentrated solution of the inner agent is formed. Such a concentrated solution can advantageously be used to quickly treat the wastewater collection system. And further, because water directed at the exposed surface of the cartridge by the spray unit continues to dissolve the second water-soluble material of the outer portion (even after the first water-soluble material is completely dissolved), a concentrated solution of the outer agent is formed and this can be used to continue the treatment of the water collection system for a relatively extended period of time. Thus, as the cartridge dissolves, the obtained solutions can facilitate degradation and digestion of organic matter present in any waste material present in the waste water collection system. For example, any released bacteria and enzymes digest organic matter in waste water (such as grease, feed, fat, and sludge), thus dissipating strong odors and rendering the waste material more fluid. Any released flocculants facilitate sludge formation and thus make subsequent digesting of the organic matter in the waste water by bacteria and/or enzymes more facile. Any released nutrients and oxygen generating materials promote growth of bacteria capable of digesting the organic matter. Dissolution of the cartridge contents to provide a concentrated solution of inner and/or outer agent(s) which can be collected and directed into a waste water collection system advantageously enhances the flow of water and waste material throughout the waste water collection system and increases the amount of waste material that can be processed.    DETAILED DESCRIPTION - A solid dissolver system (10) comprises a housing (12) comprising a cover (14) and a platform portion for receiving the cover; a cartridge (18) containing agents for treatment of waste material, where cartridge is disposed within the cover that surrounds and envelopes the cartridge and having an opening (20); a water inlet (22) into the housing, where water inlet terminates at a spray unit disposed proximate to or inside the cover opening, and spray unit is capable of directing water at a surface of cartridge, and the platform portion is capable of collecting any effluent from the water directed at the surface of the cartridge by the spray unit; and a water outlet (26) for channeling the effluent into a waste water collection system. The cartridge comprises at least one inner core (34) comprising a first water-soluble material, an inner agent, and an outer portion comprising an outer agent distributed in a binder matrix of a second water-soluble material. The outer portion partially surrounds the inner core such that at least one surface of the inner core is exposed along the surface of the cartridge. The inner or outer agent is oxygen generating materials, enzymes, bacteria, nutrients, and/or flocculants. The outer agent is the same or different from the inner agent. The first water-soluble material of the inner core has greater water solubility than the second water-soluble material of the outer portion. The inner core comprises a hollow interior and one or more end plugs sealing the hollow interior. The end plugs comprise the first water-soluble material.    DESCRIPTION OF DRAWING(S) - The drawing is an exploded view of a solid dissolver system for treatment of waste material in waste water collection system.    Solid dissolver system (10)    Housing (12)    Cover (14)    Cartridge (18)    Opening (20)    Water inlet (22)    Water outlet (26)    Inner core (34)