Gray water reclamation is a process of treating household "used water" from baths, showers, sinks, and washing machines to produce water suitable for non-potable uses such as irrigation, toilet flushing, and washing cars. Gray water is defined as any wastewater not contaminated by sewage or industrial waste.

The typical steps involved in gray water reclamation process include:

Pre-treatment: In this step, the gray water is filtered and screened to remove debris like hair, food particles, lint, and other solids.

Primary Treatment: The pretreated gray water is then directed to a settling or sedimentation tank. This tank allows the heavier particles to settle at the bottom due to gravity. This process removes suspended solids and reduces the organic load.

Biological Treatment: The water then undergoes biological treatment, which involves the use of bacteria and other microorganisms to decompose and remove organic matter. There are various biological treatment methods such as activated sludge process, trickling filters, and biofilters.

Secondary Treatment: After biological treatment, the water may be subjected to additional treatment such as filtration through a sand or activated carbon filter to remove any residual impurities and improve water clarity.

Disinfection: To destroy harmful bacteria and pathogens, disinfection methods like chlorination or UV treatment are used.

The specific gray water reclamation process can vary depending on the local regulations, quality of the influent gray water, and the intended re-use application. Proper treatment and management are crucial to ensure the safety and effectiveness of gray water reclamation systems. Reclaimed gray water should not be used for drinking or food preparation.