What kind of system must follow the intermittent sand filter to discharge effluent into the soil?

An intermittent sand filter is designed to treat wastewater before it is discharged into the soil. For optimal functioning, it is crucial that the system following the filter can effectively transport the treated effluent to the soil for further infiltration and treatment.

A pressurized system is necessary in this context because it can distribute the effluent evenly across the area where it will be absorbed into the soil, ensuring that the effluent does not simply pool in areas but rather infiltrates the ground uniformly. This uniform distribution is essential for preventing saturation in localized spots, which can lead to surface runoff or other environmental issues.

Additionally, a pressurized system facilitates the ability to reach areas that may not be accessible by gravity alone, allowing for more versatility in installation. It ensures the system operates efficiently, supports the treatment process initiated by the intermittent sand filter, and promotes healthier and safer soil absorption.

This contrasts with other systems, which may not adequately support the necessary distribution of effluent. For example, a gravity system lacks the capability to force effluent over distances or up slopes, which can limit its application in certain scenarios.