Make sure to use only one magnet and sometimes depending on container or volume which size of magnet. Don’t go to big of water vessel. Maybe but only one magnet in vessel.
Any small piece of iron like a small screw should stick to center and bounce around when unit is turned on and amplify.
For more details, please check this link:
https://www.facebook.com/groups/spooky2/permalink/1134747480020487/
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