Hi Raglan - just popped by Polly's place.
Naturally, I would just shut off my evaporative system (just a flick of the switch) yet keep my water flowing through the system (which means I don't have to bother turning a knob) and then just bunker down and do nothing.
There's nothing easier to do than nothing - no need to mount an argument or anything, you just do nothing.
If the whole place burnt down no one would remember it being there in the first place after a while.
No probs - I've got my fire plan in place, it was simple really.
The Hypenator