P-trap water closet comprising: [a] a pan with [i] a rim with a base having a water distribution hole pattern extending adjacently to the inner hole curve of the rim and [ii] a trap-way, said trap-way being round and fully glazed with smooth transition, and [b] a cistern of 2,5 Litres capacity, characterized in that [c] said trap-way has a narrowed bend with 62.50mm diameter at sump side and 70.00 mm diameter at exit side, such that the water volume and natural water resistance are reduced at the least level whereas the water volume of 2.5 Litres still provides a smooth passage of waste to maintain carrying and cleaning velocity of the water, in that [d] said water distribution pattern of said rim has [i] 5 first circle holes of 5 mm diameter, each one of said 5 first circle holes being positioned at the frontal end of said rim and oriented at 28 degrees of bending angle relative to the top plane of the rim, and said 5 first circle holes being symmetrically arranged relative to the central vertical plane of the pan, [ii] 2 second elongated holes, symmetrically arranged relative to said central plane, said second elongated holes being 85 mm long and having a 15 mm of diameter, said second elongated holes being arranged the one at the left side and the other one at the right side of the pan and the edge of each of said second elongated holes being the closest to said frontal end being distanced 35 mm in the direction of said central vertical plane, and [iii] 22 third circle holes of 5 mm diameter, distributed along said rim between said 2 second elongated holes, said third circle holes being positioned at 28 degrees of bending angle relative to said top plane of the rim and with a proximity of 20 mm from hole to adjacent hole. [a] a pan with [i] a rim with a base having a water distribution hole pattern extending adjacently to the inner hole curve of the rim and [ii] a trap-way, said trap-way being round and fully glazed with smooth transition, and [i] a rim with a base having a water distribution hole pattern extending adjacently to the inner hole curve of the rim and [ii] a trap-way, said trap-way being round and fully glazed with smooth transition, and [b] a cistern of 2,5 Litres capacity, characterized in that [c] said trap-way has a narrowed bend with 62.50mm diameter at sump side and 70.00 mm diameter at exit side, such that the water volume and natural water resistance are reduced at the least level whereas the water volume of 2.5 Litres still provides a smooth passage of waste to maintain carrying and cleaning velocity of the water, in that [d] said water distribution pattern of said rim has [i] 5 first circle holes of 5 mm diameter, each one of said 5 first circle holes being positioned at the frontal end of said rim and oriented at 28 degrees of bending angle relative to the top plane of the rim, and said 5 first circle holes being symmetrically arranged relative to the central vertical plane of the pan, [ii] 2 second elongated holes, symmetrically arranged relative to said central plane, said second elongated holes being 85 mm long and having a 15 mm of diameter, said second elongated holes being arranged the one at the left side and the other one at the right side of the pan and the edge of each of said second elongated holes being the closest to said frontal end being distanced 35 mm in the direction of said central vertical plane, and [iii] 22 third circle holes of 5 mm diameter, distributed along said rim between said 2 second elongated holes, said third circle holes being positioned at 28 degrees of bending angle relative to said top plane of the rim and with a proximity of 20 mm from hole to adjacent hole. [i] 5 first circle holes of 5 mm diameter, each one of said 5 first circle holes being positioned at the frontal end of said rim and oriented at 28 degrees of bending angle relative to the top plane of the rim, and said 5 first circle holes being symmetrically arranged relative to the central vertical plane of the pan, [ii] 2 second elongated holes, symmetrically arranged relative to said central plane, said second elongated holes being 85 mm long and having a 15 mm of diameter, said second elongated holes being arranged the one at the left side and the other one at the right side of the pan and the edge of each of said second elongated holes being the closest to said frontal end being distanced 35 mm in the direction of said central vertical plane, and [iii] 22 third circle holes of 5 mm diameter, distributed along said rim between said 2 second elongated holes, said third circle holes being positioned at 28 degrees of bending angle relative to said top plane of the rim and with a proximity of 20 mm from hole to adjacent hole.