My advice, and I hope you're still reading this thread and replies to it despite the majoritorily negative comments of members who seem to have no experience using the tool known variously as an isolation chamber, sensory deprivation, or float tank.
There is a bit of misinformation that has been thrown about in the above statements. I will try to clarify as much as I can, but I encourage you to ask questions and research it on your own. A great resource for the history of floatation or sensory deprivation is in the The Book of Floating, by Michael Hutchinson.
The first thing is, before you decide to go building or buying your own tank, is that you should probably find someone or someplace local that has one and try it out. A tank is relatively inexpensive to buy ($10-30K) and even cheaper to build ($500-8K), but it does require some maintenance and lots and lots of salt (800-1K lbs), which is very caustic to floors and home furnishings. Which is why most tanks are installed in or with a shower. There are lots of float centers around the world, so chances are you probably live close enough to one to try it out first. That being said, GO TRY IT OUT. There's no substitute for your own experience, and considering that most people here are willing to tell you what to do even though they've never experienced it means you should probably take all advice from internet forums with a grain of salt unless you fact-check every word.
Secondly, a sensory deprivation chamber is a specific type of tool. It seeks to provide a space where the constant inflow of sensory input to the body is ceased, or diminished (because like he says, we would die with NO input) so that the body can read itself. The water is warmed to average skin temperature (93-94 degrees, which is slightly lower than blood temp), and has more salt than the dead sea (epsom salt, so your skin doesn't prune) and you float. This experience of weightlessness is really key, since the only other natural place on earth to get that feeling is the womb. In such a space, without the stimulus of light or sound, and without the need for the muscles to tense up to keep one from drowning, one is able to experience a kind of total relaxation, a feeling of "floating in space." But, to be clear, the point was never TOTAL sensory deprivation. Just an environment that allows the body to form its own natural homeostatic balance.
This stimulates the production of theta waves, allows the body to "degauss" in a sense, and deep meditative states are able to be reached without years of practice. It is not exactly like the drug trip experience that some people say. So I encourage you to try it if you can, or if you did, and let us know how it went!