      POP::Surface Properties    C:\Users\KatachiHome\AppData\Roaming\MAXON\CINEMA 4D R13_05DFD2A0\plugins\DPIT Plants & Effex 2.0\res\help\EN\Effex\fx_operators_po_surfaceproperties.html                    default.tif                  Object Header   The Surface Properties node fills particles with properties that contain information about the current surface they form (liquid surface for example).<br>
These information are required in a whole lot of places such as the foam, spray and bubbles and the surface tension node.
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You get a better performance if you use a Volume Properties node, so you can exclude particles based on particle density (and only catch particles near the surface). 