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If I was to develop a sinus block, at what point would I know and what might be the repercussions? I have a big dive tomorrow, it's been planned for weeks, I've made all of these arrangements and, I'm already on location in my hotel. I've recently gotten over a cold and, I felt fine...

Could anyone tell me what is meant by unbalance piston, referring to a first stage? And, when I am told that it's a suitable first stage for warm water diving at limited depths, could someone explain what is generally considered to be "warm water" diving? Realistically, would that be tropical...