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The default relationships provided by music when creating a gross pollutant trap node are one-to-one relationships where the outflow concentration is equal to the inflow concentration. The user can modify these default relationships by clicking and dragging relevant points on the transfer function graphs, as described in Treatment treatment+devices>Treatment Devices. In this way the user is able to define the specific capture efficiency for the particular contaminant for the device being modelled. Allison et al (1998) have shown that the capture rate for different gross pollutant trap devices can vary depending on the type of device installed.
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