The single chamber lysimeter is recommended for sampling down to 10 ft (3 m).

During sample collection, a constant vacuum is applied to the lysimeter through the vacuum/pressure line, while keeping the fluid return line closed. For moist soil the optimal vacuum is about 300 mbar. Vacuum can be supplied with the battery powered vacuum pump (G-144-SW-073). The partial vacuum in the lysimeter draws pore water into the lysimeter through the porous stainless steel walls of the upper part of the lysimeter. The fluid is brought to the surface by applying positive pressure to the vacuum/pressure line and opening the fluid return line. The applied pressure forces the fluid up to the surface and into a collection bottle. Sampling duration depends on the amount of sample required, the soil type, and the soil moisture content. Sampling times can vary from less than 1 hour in wet soil, to more than 1 day in drier soil.