Welcome to our forum.
I just found something really interesting. You old timers might be familiar with it. Leslie's has a test kit that measures for bacteria in your spa including psuedomonas, the one that causes hot tub itch. At $4.99 it seems like it would be a great diagnostic tool for someone trying to figure out if the bacteria is really causing their rash.
Stuart, I agree, I think most rashes are caused by something other than the dreaded psuedomonas bacteria. It seems to be the first thing dr.'s assume, however. I thought with the test kit, people could rule out the worst case scenario of psuedomonas. Bromine, MPS, Ph levels and just plain old dry skin can all cause problems. I bet there are even times that hot tubs get blamed and they aren't even the cause.
Do you have a link where I can learn more about those? Also, where would I be able to purchase them if I wished to?