Sand filters further treat effluent from a septic tank, effluent quality is comparable with that from AWTS. Effluent is pumped through a bed of coarse sand, collected and disposed in shallow subsurface irrigation in lawns or gardens. Sand filters are generally low maintenance systems and can handle surge loads. They may be used to extend the life of the land application system.
Effluent is treated in a septic tank prior to a reed bed. The reed bed further treats the effluent through settlement and nutrient removal. Treated effluent is then distributed into subsurface irrigation a minimum of 300mm below the ground surface. Reed beds can be incorporated into landscaping. Effluent is contained beneath the rock surface of the reed bed. Reeds require some annual pruning / removal.