A water sampling device comprising: a rigid body with a bottom end opening and a top end opening; extension members extending above the top end opening and a horizontal member connected between the extension members so as to be located in a spaced-apart relationship with the top end opening; a top lid located between the top end opening and the horizontal member ; a shaft defining a first end and a second end, the first end of the shaft being connected to the top lid and the second end of the shaft adapted to receive a cable member for operating the shaft, the shaft traversing through the horizontal member ; a spring located around the shaft and in a space defined between the horizontal member and the top lid, wherein the top lid is biased towards the top end opening of the rigid body and away from the horizontal member by the spring such that, in a first state of the top lid , the top lid seals the top end opening, and wherein the shaft is operable by the cable member to pull the top lid away from the top end opening such that, in a second state of the top lid , fluid is allowed to flow to an inside portion of the rigid body ; a bottom lid co-operating with the rigid body to seal the bottom end opening in a first state of the bottom lid , and the bottom lid being separated from the rigid body and not sealing the bottom end opening in a second state of the bottom lid ; a rod member connected to the bottom lid , the rod member being adapted to traverse through the inside portion of the rigid body when the bottom lid is in the first state; and at least one polymer membrane is attached perpendicularly to the rod . a rigid body with a bottom end opening and a top end opening; extension members extending above the top end opening and a horizontal member connected between the extension members so as to be located in a spaced-apart relationship with the top end opening; a top lid located between the top end opening and the horizontal member ; a shaft defining a first end and a second end, the first end of the shaft being connected to the top lid and the second end of the shaft adapted to receive a cable member for operating the shaft, the shaft traversing through the horizontal member ; a spring located around the shaft and in a space defined between the horizontal member and the top lid, wherein the top lid is biased towards the top end opening of the rigid body and away from the horizontal member by the spring such that, in a first state of the top lid , the top lid seals the top end opening, and wherein the shaft is operable by the cable member to pull the top lid away from the top end opening such that, in a second state of the top lid , fluid is allowed to flow to an inside portion of the rigid body ; a bottom lid co-operating with the rigid body to seal the bottom end opening in a first state of the bottom lid , and the bottom lid being separated from the rigid body and not sealing the bottom end opening in a second state of the bottom lid ; a rod member connected to the bottom lid , the rod member being adapted to traverse through the inside portion of the rigid body when the bottom lid is in the first state; and at least one polymer membrane is attached perpendicularly to the rod . <EOS>