Dr Saul Pressman's book "The Story of Ozone" covers the staem sauna very well. It's available online by doing a google search. You may not you'll find a protocol for oxygen saunas, but there's lots of info on ozone saunas.
If the urine is dark and strong-smelling, it's an indication of toxins being released. Increase the intake of water to facilitate this toxin flushing.
I personally take a pinch of celtic Sea Salt with many of my glasses of water, particularly at night before bed. Wars have been fought on this planet over salt and I feel it's a vital element for the body. A good site to research salt is http://www.watercure.com I feel that salt is very misunderstood in our society in light of the two or more decades of controversy on the subject of it's role in the human body. I do not believe we should be ingesting commercial, iodized salt. We get way too much of that in every packaged food.
I hope by now you have your tank and everything's GOOD!
best of luck,