DIY passive grounding box

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Hello everyone,
I want to build a passive grounding box, I tried to search online but found none tutorial. All I can find is some pictures with comments, with which a newbie like me can't build one.

I have some questions regarding the passive grounding box:
- what material should I put in the box? I see some use crushed quartz and piezoelectric materials. However, what is the ratio specifically?
- how should I link the binding posts to the copper foil inside the box?

Can you shed some light on this?

Thank you.
Huy
 
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