NOVELTY - A water treatment apparatus, comprising: (a) treatment section(s) disposed within first housing portion; (b) treatment section(s) disposed within second housing portion; and (c) porous separator(s) disposed in each housing portion, for removing impurities from water and regulating water flow through each of treatment sections, where water flows into water inlet, through each of treatment sections in one of housing portions, through the porous separator.    USE - The apparatus is used for removing organic, inorganic, microbiological, and radiological contaminants from water and discharging potable water (claimed).    ADVANTAGE - The housing portions are detachable and sealably stackable in multiple configurations, thus passing water through more or fewer treatment layers, depending on the quality of the incoming water.    DETAILED DESCRIPTION - A water treatment apparatus for removing organic, inorganic, microbiological, and radiological contaminants from water and discharging potable water, comprises:    (a) a first housing portion (20) comprising:    (i) a top surface (24) having a water inlet;    (ii) a cylindrical sidewall integrally formed and depending with the top surface; and    (iii) a bottom surface integral with the sidewall and having a recess with holes defining mechanism for providing a long dwell time;    (b) a second housing portion comprising a cylindrical side wall having an upper edge and terminating at a housing outlet;    (c) mechanism for detachably connecting the first housing portion and the second housing portion such that the recess of the first housing portion is housed within the second housing portion;    (d) at least one treatment section disposed within the first housing portion;    (e) at least one treatment section disposed within the second housing portion; and    (f) at least one porous separator disposed in each housing portion, for removing impurities from water and regulating water flow through each of the treatment sections, where water flows into the water inlet, through each of the treatment sections in at least one of the housing portions, through the at least one porous separator, and exits at the housing outlet.    DESCRIPTION OF DRAWING(S) - The figure is a cross-sectional view of the water treatment apparatus.    Housing (18)    First housing portion (20)    Top surface (24)    Spout (56)    Plastic disk (80)    Holes (82)    Activated carbon (92)    Redox Alloy (96)    Iodine particles or resin (100)