Someone told the population in Tokyo that putting old PET bottles full of water around their property would stop cats from wandering onto their property and urinating. I think that cats are supposed to be put off by seeing their own reflection in the bottles. Because of this, you see rows of plastic bottles on walls, around property lines, and surrounding gardens. It looks stupid and ugly, and I sincerely doubt that it is effective.
I won't miss seeing organized garbage all over the place in a vain attempt to keep away cats.
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I was told people do this in case of an earthquake and water lines are broken. If they stored it inside, it might be buried in the rubble or damaged. By keeping it outside, it's an emergency source of fresh drinking water. Not sure if this is true, but it makes more sense than the cat piss theory :)
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