Low flow purging and sampling involves extracting groundwater at rates comparable to ambient groundwater flow (typically less than 500 ml/min), so that the drawdown of the water level is minimized, and the mixing of stagnant water with water from the screened intake area in a well is reduced.

Solinst Integra® Bladder Pumps are able to provide flow rates as low as 100 ml/min, using a Solinst Electronic Pump Control Unit. The Integra Bladder Pump allows very slow, steady compression of the bladder providing a consistent rate comparable to ambient groundwater flow, helping produce samples truly representative of in-situ conditions.