I put this on another thread, but I might as well put it here too.
HOW TO AUTOMATE HEMPY BUCKETS FOR A WEEK OR MORE
I had 12 plants flowering in one gallon buckets, about three weeks from finishing, and I had to leave for a whole week.
I can't remember where I got the idea, but what I did exactly was this. For every six plants, I provided a one gallon jug, placed above the tops of the buckets. You put your nutes in water as usual.
Then I ripped up a cotton t-shirt (make sure it's a 100% cotton shirt), ripped it up into one inch strips.
Cut the strips to a length so that they will reach from the bottom of the jug to the top of your hempy pot, leaving about an inch to shove down into your hempy medium. When you cut the t-shirt into strips, it will curl itself into a round shape that's perfect for a wick.
Soak your wicks. This is crucial, like priming a pump. It's also crucial that your water supply sits above your growing medium.
Then you just run your wicks from all the way at the bottom of your reservoir in a downward path to your pots. Shove about an inch of the wick into your medium, and it will draw water as needed.
Watered the plants up good before hooking everything up right before I left for the week.
Worked 100% for me, and didn't cost anything except an old t-shirt.