What is the minimum daily flow a sand filter shall be based on?

The minimum daily flow for a sand filter is based on 100 gallons of waste per day. This figure is significant as it establishes a standard for the design and operation of sand filtration systems. Sand filters are commonly used in septic systems to treat effluent through a process of physical filtration, biological treatment, and adsorption. Establishing the minimum daily flow rate at this level ensures that the systems are adequately sized to handle typical household wastewater.

A lower threshold would not account for the variability in daily water usage in households, potentially leading to insufficient treatment capacity and associated environmental risks. The 100 gallons per day standard aligns with public health guidelines and engineering best practices, ensuring that the filter can operate effectively while maintaining environmental and health safety standards.

Options that suggest a lower or higher daily flow could either underestimate the treatment needs for a typical household or unnecessarily increase the size and cost of the sand filter system, thus impacting both the effectiveness and economic viability of wastewater management practices.