A water filter defined between bottom wall, peripheral wall and a top wall and comprising four concentric compartments including, in respective peripheral to central direction a first, second, third and fourth compartment, defined by divider walls, the filter being configured to have one or more water inlets at the top wall leading into the first compartment, a first water passage linking between the bottoms of the first and second compartments, a second water passage linking the tops of the second and the third compartment, a third water passage linking the bottoms of the third and fourth compartment and a fourth water passage between the fourth compartment and a filter outlet formed at the center of said bottom wall; wherein the filter is formed from building blocks comprising: a base member comprising (i) the bottom wall with the central filter outlet (ii) the peripheral walls being integral therewith and extending upwardly therefrom, (iii) an integral sleeve formed around said filter outlet and defined by a closed-loop wall and dividing the filter's internal space into a central space and a peripheral space and comprising (iv) spacer elements (133, 135) formed on the bottom wall and extending upwardly therefrom; a sleeve insert formed by closed-loop wall having an integral bottom perforated element fitted into the peripheral space to divide the peripheral space into the first and second compartments, with said bottom perforated element serving the function of a second horizontal bottom perforated element and rests on said spacer elements to define said first water passage; a tubular insert with an integral bottom perforated element and having a lumen defined between an open bottom and a sealed top and fitted over the filter outlet, to divide the central space into the third and fourth compartments, with said bottom perforated element serving the function of the third horizontal bottom perforated element and rests on said spacer elements to define said third water passage, a porous polisher element being fitted within the fourth compartment over the filter outlet; and a lid element element sealingly fitted over the base member, wherein a second perforated divider element element formed as an annular element is fitted into the second compartment to divide the second compartment into vertically arranged sub-compartments, and a third perforated divider element formed as an annular element is fitted into the third compartment to divide the third compartment into vertically arranged sub-compartments. a base member comprising (i) the bottom wall with the central filter outlet (ii) the peripheral walls being integral therewith and extending upwardly therefrom, (iii) an integral sleeve formed around said filter outlet and defined by a closed-loop wall and dividing the filter's internal space into a central space and a peripheral space and comprising (iv) spacer elements (133, 135) formed on the bottom wall and extending upwardly therefrom; a sleeve insert formed by closed-loop wall having an integral bottom perforated element fitted into the peripheral space to divide the peripheral space into the first and second compartments, with said bottom perforated element serving the function of a second horizontal bottom perforated element and rests on said spacer elements to define said first water passage; a tubular insert with an integral bottom perforated element and having a lumen defined between an open bottom and a sealed top and fitted over the filter outlet, to divide the central space into the third and fourth compartments, with said bottom perforated element serving the function of the third horizontal bottom perforated element and rests on said spacer elements to define said third water passage, a porous polisher element being fitted within the fourth compartment over the filter outlet; and a lid element element sealingly fitted over the base member,