It’s all about gravity and pressure. Bottom airflow tanks rely on the wick to seal the juice channels at the bottom while letting vapor pass through. If your wicking isn’t perfect — too loose, too tight, or uneven — juice can seep out. Add a little overfilling, and boom, you’ve got a leak.
Top airflow tanks flip that equation. Juice sits at the bottom, airflow comes in from the top, and vapor travels up. Gravity keeps the juice away from the airflow holes, so the chances of it seeping out are far lower. Even if your wicking isn’t perfect, juice isn’t “pushed” toward the holes — it stays in the well.
In short: bottom airflow tanks need perfect wicking and careful filling. Top airflow tanks are more forgiving, which is why you’re seeing zero leaks. It’s not magic — it’s just how the juice behaves under gravity and capillary action.
Tip: When using bottom airflow tanks, make sure your wicks just touch the juice well without packing the coil too tight, and don’t overfill. That combo keeps leaks at bay.
