High capacity humidifier

Initially I bought an 1.3l humidifier. As its boring to fill it up very 4 hours and it didn't increase the humidity enough, I decided to create an own one and put it in a 22l plastic box.

I didn't measure but I think it can humidify more than 15l without refilling. And the refilling is done just by adding water on the top, instead of put something out and screw off like on normal humidifiers.
One humidifier-part should blow 0.4 litre per hour, so 0.8 should be possible.
I am actually at 0.5