How to clean carbon filter?

DaFreak said:

I don’t know, I think if you ran the equipment with 50ppm 3 times as long as say 150ppm it’s all the same end of day.

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No, we can't calculate it this way. The ultrasonic vibrates at high frequency, probably that 30-50 ppm is fine without getting it into the air but at 300-400, that's a nightmare. Just google white dust using ultrasonic humidifier, you will see that this really happens. Even for non grower people eheh

Doesn't make any sense to me, but since I don't have 300ppm I'll believe you. East solution, use a humidifier that uses heat instead like the old ones.