I have a 6 pot Easy2Grow set up that I have been gradually extending for a number of years. I would like to add the AutoBox Striaght so I can get the same benfits to my grow bags with less financial outlay. Do I need to starter kit or can I use the extension kit? As far as I can see, the only difference is I get a tee connector but no filter in the extension kit – I already have a golf filter on the outlet of my existing water tank. I am using the old 6mm connections so presumably I would need a 6mm-9mm connector to make the set-up work.