The BOD factor

If you are not connected to mains drainage you have three choices.

A basic septic tank simply stores untreated sewage solids ready for collection by tanker. Liquid overflow is smelly and potentially hazardous.

A super septic tank pumps air (including oxygen) through sewage which substantially reduces the pollution and smell content of the overflow.

A tank with integral biological treatment kit produces clear, odourless, and harmless overflow. The choice is yours.

	Sewage from the house. BOD factor of 300 or more.
	Septic tank or treatment unit. Stores solids for collection by tanker.
	Overflow. Lowest BOD factor means least health hazard