Probing - Probing is a technique used to help identify problems affecting reverse osmosis systems. Once profiling has isolated a salt rejection problem to a particular pressure vessel, or set of vessels, probing can be used to further isolate the problem.

Probing involves inserting flexible tubing through one of the vessel permeate connections as a means of diverting the permeate from a specific area within the elements. This water is then tested for conductivity with a portable meter.

Probing must be performed while the reverse osmosis system is operating. The tubing is worked through various fittings to the other end of the vessel. It is then gradually pulled back as diverted water samples are tested. The end of the vessel should be sampled and then every 8 inches (20-cm) through the whole of the vessel. Sufficient time (30 seconds) should be allowed between samples to be sure that water from the new sampling location has completely displaced the water within the tubing.

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