Hi Katia!
It starts making the sound whenever I start the machine, but only when the output is higher than 3lt/min (for now). It is not like crying, it is more like chirping of a bird, and not louder than the machine, but it is a higher pitch! It is hard to explain! I wish I could send a video... ( it is located in a good ventilated space, with enough distance to the wall. We're living the spring, thus it is located in a normal temp. (20-25 celcius)...
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