What is the maximum duration gray water can be stored for flushing toilets or urinals?

The maximum duration gray water can be stored for flushing toilets or urinals is 72 hours. This timeframe is crucial because gray water can quickly become a breeding ground for bacteria and pathogens if stored for too long. Keeping it within a 72-hour limit helps to minimize health risks and ensures that the water remains relatively safe for reuse in non-potable applications such as toilet flushing. After this period, the quality of the gray water may deteriorate, leading to potential hygiene concerns and unpleasant odors. This understanding aligns with best practices in wastewater management to promote public health safety while maximizing resource reuse.