The worst problem I had in my studio was water. Before I had a sink I used a hose outside to wash everything down or wash everything in a 5 gallon bucket. I now have a sink, but I need to be very careful about what goes down the drain. I put a 7-6" PVC pipe that matched the diameter of the drain. I had some silica caulk and spread this on one end of the pipe. I then inserted this into drain. This allows me to run clear water into the pipe (I put a wide funnel on top of the pipe so I could aim the faucet into it) but all my rinse water goes into the sink. At the end of each day, I siphon off the water from the sink into a bucket under the sink. The next morning I can sponge all the gunk from the sink and dispose or recycle. When the bucket under the sink is full, I allow it to sit for a couple of days and settle. I then siphon the clear layer of water down the drain.
This is similar to what I am doing now. I am using buckets to collect the clay sludge. Any tips on efficiently cleaning those buckets once they are full? How do you dispose of your clay? It's kind of insane, but I slop out all the mud into a trash bag filled with crumpled newspaper to sort of soak up the clay and bulk it out so it's not so heavy when I take it out to the trash. I do this multiple times until the bucket is empty, and then I rinse and wipe the bucket and dump the rest outside. It's a pain in the butt! Plus it smells really bad, too.