There are several types of groundwater sampling pumps including the Bladder pump and retrieving a groundwater sample using a Bladder Pump or Double Valve Pump, requires answers to two questions - how much pressure and how much volume of drive gas is required? The drive gas is usually air or nitrogen delivered through portable gas cylinders or an air compressor. Portability to the site and the pressure requirement for the application, are the main deciding factors.
Glossary for Water Quality Testing Terms
Below are the terms relating to Water Quality Testing for the section you have selected.