Is it normal for urine to be placed for a period of time with white precipitates?

Normal urine is clear and transparent, although the appearance looks clear and transparent, but in fact urine contains more salt components, such as urate, phosphate, carbonate and other components, urine just discharged when we can not see. However, after standing for a period of time, with the evaporation of urine water, the salt components in urine are in a supersaturated state, so they precipitate from urine, and the bottom of urine will appear as white sediment, which is a normal phenomenon. Therefore, do not worry too much, it will not cause harm to the body.