Sand (Molecular) physics and particle system

Support Particles and Physics Simulations
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Dear blender community,

 I was watching some videos, and I decided to do some more physics.  I found a great video called "9 ways to destroy things" (https://youtu.be/wJFE2pb0Ri4?t=335) and I was having troubles with the sand (or Molecular) simulations. The video teaches it very, very fast and I was wondering if anyone had previously worked with sand/molecular simulations and could enlighten me.  Also, a side question, would the sand particles be affected by (for example) a fluid simulation?  Like if I dropped the sand in water, would it be affected by the movement of the water at all?  Thank you all, and happy blending.

-Keto

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Also, a side question, would the sand particles be affected by (for example) a fluid simulation? Like if I dropped the sand in water, would it be affected by the movement of the water at all?
The fluid simulation does not exert any forces so the fluid cannot affect a particle system and a particle system cannot affect the fluid simulation. Just fake the result you want