Many reviews say this stone does not release as much air as shown in the pictures, so good for me. A couple of notes though: if you use a straight-through connection (you can connect the incoming air on one side and another tube to another vent on the other) you won't get as many air bubbles. So keep this in mind, it seems like a lot of air is going through the other tube, sacrificing its own usefulness. But if it's the only stone you'll have, great!
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