Paph Sanderianum Culture?

[naoki]

If you use really hard water with ultrasonic humidifier, you may get white dust. But I use RO water. Evaporative-type humidifier won't create white dust, but you'll need to replace the filter. The humidifier humidifies the room, so don't directly blow on the orchid. With that much of humidity, you'll probably be ok although it is nicer to have a little more in the winter. It is weird why you get higher humidity indoor than outdoor in the winter. Usually it is opposite (warm indoor air CAN contain more water than cold air outside, so indoor RH is lower).