What type of laundry trays are no longer permitted due to their lack of sanitary surface?

The type of laundry trays that are no longer permitted due to their lack of sanitary surface is concrete. Concrete laundry trays are porous and can retain moisture, making it difficult to maintain proper sanitation. Over time, these trays can also develop cracks and chips, which can harbor bacteria and other contaminants that pose health risks.

Effective sanitation in laundry areas is critical, and materials that can be easily cleaned and do not absorb water or stains are preferred. This is why alternatives such as plastic or metal, which provide non-porous, easy-to-clean surfaces, are commonly used.

Understanding the properties of different materials in relation to hygiene is essential for making informed choices in home design and renovations, particularly in areas like laundry rooms where sanitation is crucial.