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They have that here in the USA too, it is a red chemical that will activate in water if there is whatever the lead chemical found in urine... the red die only stands for so long after the person pisses in the water. Depending on how strong the urine stream is, is where the darkness of the red will come up. A lot of people use that in their personal pools. However, resorts etc are not allowed to use it because of violation of rights etc.
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