Abstract: A liquid purifying attachment for dispensing a liquid from a container, which includes a cylinder fluid-tightly attached to the container, and a piston fluid-tightly fitted in the cylinder bore such that the piston is slidably movable between a retracted and an advanced position, relative to the cylinder. The piston and the cylinder define a cylinder chamber into which ambient air is introduced upon movement of the piston toward the advanced position. The introduced air is compressed and fed into the container upon movement of the piston toward the retracted position, to deliver the liquid out of the container, through a filter disposed in a liquid delivery path which is exposed to the ambient air and communicates with the liquid mass.

Abstract: A device for dispensing a liquid, including a container having an interior space accommodating the liquid, a first valve attached to the container, a delivery path having one end submerged in the liquid and extending through the container such that the other end is outside the container, and a second valve disposed in the delivery path for closing and opening the delivery path. The first valve permits a pressurized gas to flow therethrough into the container to raise the pressure within the container, but inhibits a discharge flow of the pressurized gas and the liquid therethrough out of the interior space. The liquid is delivered out of the container through the delivery path, due to the raised pressure within the interior space. The device has a micro-porous membrane filter disposed in a portion of the delivery path which is located upstream of the second valve, as viewed in the direction of delivery of the liquid.