I had a nice size bowl of water in mine and when I let my jugs of water sit for 24 hours I just leave it in my grow room to add to the water vapor. I mean it doesn’t compare to a humidifier but it’s been keeping me within my RH range. I started off around that 20-30% range started leaving bowls of water out and making sure my soil was hydrated and the humidity shot up. I’m still a rookie but that has been working for me. If I couldn’t get a handle on the levels I would grab a little baby humidifier