To obtain a sample the tube and foot valve are lowered to the desired depth and rapidly pumped up and down, either manually or mechanically. The lightweight WaTerra Pump Handle is used for manual pumping, and is very inexpensive and highly portable.
This makes it excellent for use in remote locations. The electric or gasoline pump control units are ideal for larger volumes of water, higher pumping rates, and longer time periods. All provide excellent well development, and efficient purging and sampling of monitoring wells.