Dispenser of acqueous liquids through an interface membrane that is partly hydrophilic and partly hydrophobic, such that during each liquid-dose dispensing operaiton, air and liquid circulate alternatively in a capillary tube (18) downstream of the membrane. Said interface membrane (7) comprises a filtering material which incorporates biocide metal cations into its mass. Said dispenser comprises a porous plug (8) permeable to both liquid and air, which is placed upstream of the membrane along the fluid path and is made of a material comprising negative charge sites that can attract biocide metal cations from said membrane.本發明提供通過部分親水性且部分疏水性之一界面薄膜的水性液體之分配器,使得在每一液體劑量分配操作期間,空氣及液體在該薄膜之下游的一毛細管(18)中交替地循環。該界面薄膜(7)包含一過濾材料,其將殺生物金屬陽離子併入至其質量中。該分配器包含一多孔塞(8),其對液體及空氣兩者可透,該多孔塞(8)沿流體路徑置放於該薄膜之上游,且由包含可吸引來自該薄膜之殺生物金屬陽離子之負電荷部位的一材料製成。2‧‧‧容器/瓶3‧‧‧基底4‧‧‧籃5‧‧‧噴嘴6‧‧‧蓋7‧‧‧薄膜8‧‧‧多孔塞10‧‧‧瓶頸11‧‧‧中央圓盤12‧‧‧旋擰13‧‧‧拱形件15‧‧‧外部周邊凸耳16‧‧‧支撐翅片18‧‧‧毛細管
