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I put one of those on a cyklon, and did a couple dives switching back and forth between cyklon with silencer and standard cyklon. Bubble size is reduced, but the volume remains the same.The device did not make a big difference IMO, the biggest factor has to do with exhalation technique. With or without the device, a slow & gentle exhale is not very noisy and a quick forceful exhale makes substantial noise.