Thanks for the explanation and helpful tip!ecstatichamster said:post 117540 Both these devices don't contain big enough reservoirs for CO2. So what I do is beyond a certain CP, recommend students put the device into a big jug or jar, cover the top with a towel, and use the device mouthpiece that way. The device in the big jar or jug concentrates the CO2 and makes the exercise much more effective.
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