We have a small septic system here at our summer place, and I don't pour colored rinse water into it. I thought I was being careful ferrying buckets of rinse water up the basement stairs to dump outside, but the work has been exciting and I was really cranking out the finished product; I hurt my back with the multiple trips. Rats. That has slowed production, I'm afraid.
I've been working on cotton floss, striving to produce colors with subtle variations along the lines of the Weeks Dye Works floss. The final steps in the process are all done rather blindly, and it's hard to tell what you have until the last step, when the finished floss is ironed and skeined, and only then you can see how the subtle striations of color travel through the threads. It's hard to tamp down the urge to pursue the task aggressively until my back feels better.