Dig a drain pit approximately 12" to 24" deep and 12" to 24" wide. Add about 24" or more of loose fill such as sand or crushed rocks below the drain pit. Add lime stone gravel inside the drain pit.

Guide the waste hose that comes with the toilet towards the drain pit. Connect the hose to a PVC pipe and guide it into the center of the drain pit, ensure that the pipe will gravity feed the liquid waste into the drain pit.

Next you will need to cover the top of the lime stone gravel with a plastic cover. On top of the plastic cover add another 2" of earth; then add another 6" to 10" of sand, soil, and grass, which will protect the drain pit from rain. It is important that the drain pit get installed about 50 ft. or more away from any water source, 60 ft. or more from any well and away from any high water table.

Be sure to check local authorities for any restrictions regarding drain pits.