While it is possible that a temporal nutrient pulse moving down through the soil solution could displace nutrient ions already adsorbed on the membrane surface, the nutrient concentration required would be atypical of those naturally found in soil solution. In order to displace adsorbed ions from the PRS™-probe ion-exchange membrane, a salt solution of at least one molar is required. Using forest soils as an example, the NO₃^- concentration required then to displace adsorbed nutrients is 8000 times larger than concentrations typically measured. Although agricultural soils have larger NO₃^- pools, a NO₃^- pulse of several thousand times larger concentration than normal soil solution values would be required to desorb nutrients from the PRS™-probe. Therefore, it is improbable that mass action displacement would be a concern in most if not all research studies. As previously mentioned, a PRS™-probe is NOT a dynamic ion-exchanger, but instead conforms to Donnan equilibrium principles; however, if the PRS™-probe is left in soil long enough to saturate the ion-exchange membrane, then it will act as a dynamic ion-exchanger.