Grounding with a Earth box?


OK so help be understand something.   I understand the value of grounding equipment, but what is the value of having a woodbox with salt, earth, minerals etc  do for grounding?  How is supposed to work or be better?


brubin
I put cat litter in a beer can with a wire and it works.

I can gear the difference...

some of this stuff is crazy ass snake oil.
So per the website https://www.entreq.com/products/ground-boxes-17667704

it supposes to lower the noise floor since the home electrical system is full of interference.  
I was thinking if this is true - then why not just add a new ground rod and bring it into the house (if possible) ?   A ground rod and wire would cost less than $50 vs a box of dirt and minerals.    Any thoughts?