After 4 years of hearing two Tetra 'whisper' air pumps in my goldfish tank I decided to invest in a higher quality indoor unit. worth every penny. I've been using the dual sponge filter on medium settings for a month now and it's still a little over the top. I only hear it from more than 5 feet away when there's no ambient noise and it doesn't rattle with something against it yet. I know these are dear people, good things are always expensive.
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