Thank you ,my wife feels lucky compared with some ,she has a "bad " toe but the rest are swellings not disfigurement .The cold water helps my old knees as well. I made a hot tub from 4x2s but we only used it a few times per year and with having to change the water every time it was a bit of a pain .We do't have one now as with most things they are nice but you can live without ,it is the cold that is best for us .I must say that -10° in a hot tub was special though .That looks gorgeous @blue1948. I once did a hot tub on holiday in February near Polglass in Scotland but I’m pretty sure it was much warmer than that. Stargazing was amazing tho and I bet it is there too. I’m glad it helps your wife, it’s such a painful and debilitating illness.