The DIY humidifier

I built one of the diy humidifiers and have had it running for the past day and half but i dont think it is working, could sum one that knows how they work please tell me what i am looking for to see if it is working or not, im useing a airpump made for a 30g tank. thanks for ur time

Put some soapy water or dish detergent around the joints (where the tubes go into the bottle) to check for leaks - also make sure the tube coming INTO the humidifying chamber goes down into the water.