Hi criollito... in the export central (in export tab in Realflow) you can see where Realflow exports the bin files that contains your simulation.
In Max, create a Frost object and under "Particle Files" tab load that sequence of bins (just select one, Frost automatically load the whole bunch).
After that you need to play with the meshing settings of frost (way faster than Realflow).
Important settings are under "Meshing" (generaly anisotropic is better for liquids in my opinion.
Other one to look for is "particle size", find one that suits your units.
Check this tutorial also....