To refill, simply lift up the silicone cap on top of the chamber and fill it with the liquid comes with the device. 

Make sure toCLOSEthe silicone cap tightly after refill.

There are 4 signs to look for that hints at a damaged chamber:

1. When the machine displays "TANK FAULTY" when chamber is installed.
2. When the Chamber starts to produce an unpleasant burning smell (Usually after ~100 hours of spray time.)
3. Machine keep prompting "TIME OUT" warning during normal operation.
4. When the smoke becomes very pale even in high smoke levels.

In these 4 cases, it is highly likely that the chamber is damaged, or has reached the end of its lifecycle. Please replace a new chamber.

Each Chamber is designed to support 100 Hours of smoke output.