I used one on a minnow bait bucket. Keeps my minnows alive all day. Releases many bubbles all over the stone. Others I've used in my aquarium and they release a few bubbles. After 2 weeks I was concerned, I was seeing fewer blisters and even though the stone was clogged. It turned out that my air hose was kinked. After I straightened the hose it worked like new.
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