Self watering gallon jug tower garden

Hi, just wanted to share something I built in my garden, I apologize if this is the incorrect forum! I got the idea for the tower garden based on this video:



But I didn't have any two liter bottles, so instead I used gallon jugs. Sand will go in the top funnel jug to filter the water. There is full drainage through the tower. I plan on growing lettuce out of these. I used a potting mix of what I had available at the moment: peat moss, mushroom compost, and a sprinkle of dolomite. I'm not sure if that is a great potting mix, but it was all I had. Each jug is zip tied to the trellis for stability. Any thoughts on how I could improve it? Thanks for any comments.

Chris

Looks cool! Is there any thing running through the middle of the bottles, like a cord or a piece of conduit?

Hi,
It looks great, keep up the good work.