I've been using a small, cheap dwc made from a coffee container. This one seems to work well. I noticed after cleaning out the first batch, a little algae in the corners. The plastic is pretty thin, and probably lets a little light in. Covering it would help, or just switching out with a clean one every so often. Here's a video I made over the weekend describing the materials and process used.Â
I've posted some about it here and there on my glog.
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