The Pump consists of a riser tube fitted with a one-way footvalve. It can be easily operated manually at shallow depths, or by using a surface pumping mechanism. The tubing and footvalves come in a range of sizes suitable for most well diameters and sampling applications. To obtain a sample, hand-thread a footvalve onto the tubing, and then lower to the desired depth in a well or borehole.
Repeatedly lower and raise the assembled tubing and footvalve approximately 6" - 12" (15 - 30 cm). A slug of water enters the tubing on the downward stroke and is retained, as the valve closes, on the upward stroke. This enables the water to gradually rise in the tubing and discharge at surface.