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

https://www.scribd.com/document/1022891986/Soil-pH-and-Electroculture-Finding-the-Sweet-Spot-136899

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.