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Volumetric Heat Haze – This method requires V-Ray. It produces the same result as the Volumetric Geometry option, and also adds a heat haze effect when used with the Heat Haze parameter. Note that you might need to increase the Max depth of a VRayMtl with refraction in case it intersects with the Heat Haze shader.

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ImplicitSurface ImplicitSurface

Isosurface – This method requires V-Ray. It produces a procedural isosurface without polygons at render time using the Isosurface Level option. Compared to the Mesh mode, the result is always smooth but will take longer to render. If  In case in Mesh mode your mesh is too jagged and edgy, and smoothing it out is too slow or impossible, this means you should switch to to Isosurface mode  mode instead. 
Mesh – The content is converted into a standard 3ds Max mesh using the options in the Mesh Smoothing section. This mode is mostly used for liquids but can be applied to thick smoke using a scatter material or to plumes of smoke to create effects such as large underwater bubbles.
Ocean Mesh – The grid content is extended to a flat area, fitting the camera's view.  In most cases, this mode is used with a displacement texture such as the Phoenix FD Ocean Texture.
Cap Mesh – Only the upper liquid surface is rendered. This mode can be used for swimming pools and other placid liquid surfaces.

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ImplicitSurface ImplicitSurface

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