How often do you guys change your mask & tubes? I'm suddenly getting calls every week from the company from which I bought my machine - saying that I should change my mask & tubes every 3 months. This would be a little more believable if they didn't wait until I had had the machine for almost 2 years before starting the phone calls.....I'm just curious.(I wash out my mask & tubes regularly, but haven't replaced them. Everything seems to still be fitting properly.)
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