One of the issues when designing a pottery studio is how to handle the whole clay-mucking-up-the-plumbing problem.We never got around to adding running water to our studio, so we don't have plumbing to worry about. Our water source is pictured above~ the downspout from the studio roof runs into a plastic (sorry) bucket which overflows into one of our sinks, then the runoff drains away underground. From time to time, Mr. Cranky fills a bucket in the studio with fresh water from the downspout and that serves as our sink. Used water is simply pitched out over the bank. That's it.
If you have plumbing you want to protect from gunk, have a look at how Emily Murphy does it here.