Rim block system for installation on a toilet bowl lateral inner edge or on a urinal bowl lateral inner edge, comprising: a) a holder formed to fit, in the form of a clip, to the toilet bowl lateral inner edge or the urinal bowl lateral inner edge, respectively, wherein the edge forms a clamping surface with a clamping surface thickness and a lower rim, the holder being substantially U-shaped by - a rear wall with a horizontally extending lower and an upper rear wall end which extends vertically and is formed, in the mounted state of the rim block system, parallel to the clamping surface, - a bottom wall with a front and a rear bottom wall end which is formed horizontally, the rear bottom wall end being integrally connected to the lower rear wall end, - a front wall, having a lower and an upper front wall end, which extends substantially vertically and is formed parallel to the rear wall, the lower front wall end being integrally connected to the front bottom wall end, - a bow clip, having a rear bow clip end and an opposite front bow clip end, the rear bow clip end being integrally connected to the upper rear wall end, the bow clip extending from there at an acute angle to the rear wall in the direction of the lower front wall end, - the bottom wall or the front wall having a slot with an elastic slot opening, which is smaller at an inlet of the slot than further away from the inlet so as to allow sliding in, locking into place when overcoming a threshold of the slot opening and pulling out a matching hoop, with - the rear wall, the bottom wall, the front wall and the bow clip being embodied such that the holder can be plugged onto the clamping surface with the clamping surface thickness and clamps the same in the plugged-on state; b) a rim block container having a fastening element with at least one scented block connected to it, the hoop matching the slot being formed on the fastening element so as to be able to engagingly connect the rim block container to the holder and release it from the same. a) a holder formed to fit, in the form of a clip, to the toilet bowl lateral inner edge or the urinal bowl lateral inner edge, respectively, wherein the edge forms a clamping surface with a clamping surface thickness and a lower rim, the holder being substantially U-shaped by - a rear wall with a horizontally extending lower and an upper rear wall end which extends vertically and is formed, in the mounted state of the rim block system, parallel to the clamping surface, - a bottom wall with a front and a rear bottom wall end which is formed horizontally, the rear bottom wall end being integrally connected to the lower rear wall end, - a front wall, having a lower and an upper front wall end, which extends substantially vertically and is formed parallel to the rear wall, the lower front wall end being integrally connected to the front bottom wall end, - a bow clip, having a rear bow clip end and an opposite front bow clip end, the rear bow clip end being integrally connected to the upper rear wall end, the bow clip extending from there at an acute angle to the rear wall in the direction of the lower front wall end, - the bottom wall or the front wall having a slot with an elastic slot opening, which is smaller at an inlet of the slot than further away from the inlet so as to allow sliding in, locking into place when overcoming a threshold of the slot opening and pulling out a matching hoop, with - the rear wall, the bottom wall, the front wall and the bow clip being embodied such that the holder can be plugged onto the clamping surface with the clamping surface thickness and clamps the same in the plugged-on state; - a rear wall with a horizontally extending lower and an upper rear wall end which extends vertically and is formed, in the mounted state of the rim block system, parallel to the clamping surface, - a bottom wall with a front and a rear bottom wall end which is formed horizontally, the rear bottom wall end being integrally connected to the lower rear wall end, - a front wall, having a lower and an upper front wall end, which extends substantially vertically and is formed parallel to the rear wall, the lower front wall end being integrally connected to the front bottom wall end, - a bow clip, having a rear bow clip end and an opposite front bow clip end, the rear bow clip end being integrally connected to the upper rear wall end, the bow clip extending from there at an acute angle to the rear wall in the direction of the lower front wall end, - the bottom wall or the front wall having a slot with an elastic slot opening, which is smaller at an inlet of the slot than further away from the inlet so as to allow sliding in, locking into place when overcoming a threshold of the slot opening and pulling out a matching hoop, with - the rear wall, the bottom wall, the front wall and the bow clip being embodied such that the holder can be plugged onto the clamping surface with the clamping surface thickness and clamps the same in the plugged-on state; b) a rim block container having a fastening element with at least one scented block connected to it, the hoop matching the slot being formed on the fastening element so as to be able to engagingly connect the rim block container to the holder and release it from the same.