a Harbor Freight 5-gallon bucket can become a DIY filter system. Aquarium Co-Op on YouTube demonstrates just how it's done. 1. Using a hole saw, cut an off-center hole out of the bottom of the bucket.

It can be done in a small, indoor space, and the only equipment needed is a 5-gallon bucket with a spout and tight-fitting lid, and a bag of inoculant to kick start the fermentation process.