Additive carrier for spin on filters

An additive carrier for a spin-on filter, the additive carrier comprising:

• a top wall including a retainer-receiving seat, an upper planar surface, and an outer perimeter, the retainer-receiving seat including:
• a bottom wall spaced apart from the upper planar surface and formed to include an opening extending through the bottom wall;
• and
• a frustoconical section positioned to extend at least partially around the bottom wall, the frustoconical section extending from the bottom wall to the upper planar surface;
• and
• a cylindrical retaining wall coupled to the top wall along the outer perimeter and extending downward from the upper planar surface, the retaining wall defining a plurality of downwardly extending projections and a plurality of gaps that are positioned between adjacent projections, the projections circumferentially spaced around the retaining wall,
• wherein the top wall and the retaining wall together define a circumferentially extending bottom recess configured to receive and store an additive material, and the plurality of gaps are in fluid communication with the bottom recess.

A spin-on filter comprising:

• a filter assembly;
• an additive carrier comprising:
• a top wall including a retainer-receiving seat, an upper planar surface, and an outer perimeter, the retainer-receiving seat including:
• a bottom wall spaced apart from the upper planar surface and formed to include an opening extending through the bottom wall;
• and
• a frustoconical section positioned to extend at least partially around the bottom wall, the frustoconical section extending from the bottom wall to the upper planar surface;
• and
• a cylindrical retaining wall coupled to the top wall along the outer perimeter and extending downward from the upper planar surface, the retaining wall defining a plurality of downwardly extending projections and a plurality of gaps that are positioned between adjacent projections, the projections circumferentially spaced around the retaining wall,
• wherein the top wall and the retaining wall together define a circumferentially extending bottom recess configured to receive and store an additive material, and the plurality of gaps are in fluid communication with the bottom recess;
• and
• a retainer comprising:
• a first end;
• a second end spaced apart from the first end;
• a bowl shaped section extending between the first end and the second end;
• and
• an aperture formed in the bowl shaped section,
• wherein the retainer is positioned within the retainer-receiving seat of the additive carrier such that the aperture is concentric with the opening, and the retainer is coupled to the filter assembly to trap the additive carrier relative to the filter assembly.