The American Dj Bubbletron is a very good bubble machine which is a complete sealed unit which reduces the risk of any leakage. The ADJ Bubble tron has a good output of bubbles and also has an on / off controller which has an 8m cable so you can position the bubble machine is wherever is best at your gig,
Specifications:
Portable high output bubble machine - creates hundreds of bubbles per minute
Durable plastic casing with EZ-Access front fluid tank
Large high velocity fan makes bubbles rise quickly in the air