Thank you, it only wastes when someone is not drawing, otherwise as long as your tube fits in the bowl your good, the current from drawing in your air will keep the vapor running into your tube.

Give it a shot and see what you think. You can use a bag and attach it to the top of the bottle and draw it all into the bag like a more expensive vaporizer if your concerned about waste.

I only add a small amount of material at a time so I can try not to waste.

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