Space saving bubble wall, very robust, requires only 1 quart of water. A Bubble Wall is a great way of saving space especially in a sensory room. It is strong and sturdy and only requires 1 quart of water!Compatible with our wired, wireless and App color/pump controllers.Bubbles can also be dialed up or down with the speed adjustment feature.Switch compatible to control the bubbles.This unit is for wall mount only, it will not stand up on its own.Maintenance: Use only distilled water to fill the Bubble Wall. Add one capful of Bubble Tube Additive (9BCCA) each month to keep water clear. Evaporation of the water is a nature occurring process. Add distilled water when this occurs. To clean the outside of the Bubble Wall we recommend our Bubble Tube Cleaner (9BCC).See care and maintenance instructions at the bottom of this page.