So I decided to change the cartridges in my autodrip today. I have three cartridges consisting of sediment and two carbon blocks. All went well but when I opened up the water line the first two containers filled with water but the third did not. I have gotten it to fill with water but there is no water coming out of the drip that is in my tank.
I am guessing there is air trapped in the line but how the hell do i fix it. Below is a pic of the cartridges.

I am guessing there is air trapped in the line but how the hell do i fix it. Below is a pic of the cartridges.
