posted 7 years ago
I made a worm tower out of stack-able 5 gallon pails.
The bottom pail has a spigot and a level indicator that tells me when it needs draining. I have three levels, the bottom level acts as a sump for collecting leachate, the middle one is finishing compost, and the upper one is where I dump the tea leaves, banana peels, apple cores, melons, squash etc.
I don't add bedding, or any liquid, and I drain the sump maybe once every 6 months.The rate at which I feed them means that I get a 5 gallon pail full of castings every 12 months, and it takes 2 years to get a completed pail. It's no exactly mass production, but it's enough for seed starting and potting.
It's about as low maintenance as it gets I think. Each fall, I take the middle pail and scoop out the top layer of castings where the worms hang out. The rest goes into a container where it sits until I use it. I clean out the pail, put the worms and castings I scooped out back into the pail, and it becomes the top pail in the tower.
Now, the fresh castings still have some worms and eggs in it so a month or so later I come back and scoop any worms out that are hanging out in the top layer. Since I live in zone 3, I then take the castings and put them outside to sit at -20 C for a month or so. That kills any unhatched eggs and worms. I do this because I have found that seedlings and potted plants do not get along with composting worms.
Oh, and during the summer I keep the tower outside, but in the fall I put it down in the basement. It doesn't smell, or leak. Sometimes I get the odd fruit fly explosion in the fall, but they die off and go away.