I have seen on tv a system that pumps water from the pool and sprays across the roof and into the rain gutters to be collected and repumped, and down the walls of the home into troughs to be collected and repumped. The pumps were powered by electric with backup by a diesel generator with a protected fuel tank.
This wasn’t just a sprinkle of water, it was a literal wall of water covering all exterior surfaces of the home. The purpose is to prevent wind blown cinders from igniting the house.
It looked like it could work. I never saw any follow up.
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