For balcony growers, compact coil pots use a small copper helix inserted into the medium

https://www.scribd.com/document/1026440688/Electroculture-for-Beginners-Simple-Setups-and-Safe-Practices-178833

For balcony growers, compact coil pots use a small copper helix inserted into the medium, aiming to localize subtle charges near roots without requiring tall poles or complex grounding arrangements.