What is required if a sand filter is designed for a non-residential property with a flow of 801 gpd or more?

If a sand filter is designed for a non-residential property with a flow of 801 gallons per day (gpd) or more, it is required that effluent must be pumped to the sand filter. This requirement is primarily due to the need for proper distribution of wastewater, which may not be adequately achieved through gravity flow alone, especially at higher flow rates typically associated with non-residential properties.

This pumping mechanism ensures that the effluent is evenly distributed within the sand filter, promoting efficient treatment and preventing issues such as overloading, uneven flow, or failure of the system, which could occur if the effluent relied solely on gravity. Additionally, ensuring that the effluent is properly pumped helps maintain the functionality and longevity of the sand filter system, which is critical for effective wastewater management in non-residential settings.

Other options, while potentially relevant in different contexts, do not meet the specific requirements for a system handling flows of this magnitude. Having pump requirements ensures compliance with regulatory standards and enhances the performance of the wastewater treatment system in a non-residential application.