Typical lifespan of outdoor wash basins made of PP material

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As the title suggests, it’s an outdoor PP washing tower with a diameter of around 2 meters and a height of around 4 meters; it is exposed to sunlight and rain, and has been in use for 5 years. The coordinates are 021 (as some people suggested it might be related to low temperatures in outdoor environments). Recently, management noticed that the surface of the tank has turned white, and there is powder on its surface when scraped with a key – does this indicate that the tank is nearing the end of its useful life? Experts with experience, could you tell me how long the lifespan of PP material wash basins is generally? I won’t send any pictures; I suppose even experts can imagine that, from my point of view, such sinks are generally not given much attention – they’re used until they break, and the safety risks associated with them are acceptable. For example, the pH of the water used for washing is not high, and the amount of water used is also small. It doesn’t matter even if it collapses. There are 13 companies, and the cost of replacement is almost over 5 million. Moreover, they are using the pretext of safety to deal with their foreign headquarters. I work in the field of safety, and it seems like I’m about to get scammed. That’s my concern. I hope my friends from Sichuan can help me and give some advice