So with the bottom plugged when I breathe in with the hydratube and the water rises that means the crack is letting air in right? The water shouldn’t rise at all if the bottom is sealed?As long as you have made a solid seal, you should not be able to blow into the top without air coming out the bottom; there is nowhere else for the air to go. The reverse is true also, i.e., bottom plugged you should not be able to draw air up. A crack can be quite small, so the escaping air may be slight. Where you suspect the crack is located, is where that typically happens when it does. Note that it is conceivable that a small crack could be opened up by forcefully pulling/pushing air - the bamboo is rather thin glass. Also that there have been reports of being able to use the Evo despite there being a small crack, albeit with performance compromised. IIRC ~$75 for bamboo replacement.