Low flow sampling method
It is a sampling of the water (also called low-flow) of a dynamic type in which, after the first phase of purging the piezometer and the subsequent stabilization of the aquifer, the flow rate of the pump is reduced in order to minimize the disturbance of the sample , inducing a minimum lowering of the aquifer level and limiting its turbulence and stress.
Very modest flow rates of less than 0.5 l/min are therefore expected, which can be obtained, for example, by means of ProActive 12V pumps coupled to a flow regulator.
The use is extremely simple: the pump is connected to a delivery pipe and to the flow regulator, which in turn is connected to a normal 12V battery through the terminals installed on its electrical cable. The pump starts and you can then adjust the flow via the knob of the regulator.
The flow can be further reduced up to 10 ml/min thanks to the special valve to be mounted on the pipe.
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