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Surface Timer: Unlike the PosiFlo-2 the timer is located in a separate box above ground to ensure that the pneumatic logic does not become contaminated by vapours from the DNAPL.

Borehole Size: Although it will fit into a 50mm borehole it is recommended that a minimum of 4” (100mm) is used due to the slow nature of the well yield as a result of high viscosity and density of DNAPL.