Is it ok to add water that has PH down in it into my humidifiers?

Is it OK to add water that has PH down in it into my humidifiers? I don't plan to PH my humidifier water, but I would like to dump the remaining amount from my watering can into the humidifier whenever I am done watering with plain water.

The increased acidity is corrosive, so yes potentially bad for the humidifier if any non-plastic components exposed.

OK, thanks. 2 more questions.
1.) Is it safe to ph water with ph down, then store it in a water cooler jug?
2.) can fertilized water be stored for future use after mixing?

1. Yes
2. I mix a few days at a time, mostly because I mix instructions ratio to1 gallon the dilute it to whatever ppm I actually need. Sometimes your 1 gal turns into 2.5 gal, then you don't have to do anything but check ph before you feed. I put a air stone in my stored nutes and cover them, keep the cool, etc.