Septic Tanks consist of a series of chamber in which the organic waste from buildings will separate, settle down and anaerobic treated by bacteria.
They are manufactured from linear polyethylene [HDPE] with the Rotational Moulding method, is absolutely sealed, they will not be degraded by waste water and have unlimited life. The septic tank is shaped in such a way that the incoming flow will be decelerated to a slow and uniform flow to allow separation between solid particles, which will settle down to the bottom of the tanks, from the ones that are lighter (oil, fat and lightweight solids), that will float at the surface. Using a combination of two chambers, it will prevent sludge and floating particles to enter the second chamber. Installation requires minimal time and can be accomplished without special tools; the operation does not require electrical power. The specification of septic tanks is regulated by the legislation.
For houses, under normal conditions, the volume of the septic tank is calculated using 300 liter per person rule and 1.5 tenants for any main room of the house. Similar rules apply for apartment houses, hotels, schools etc., however the minimum volume of a septic tank may be as low as 2000 liters.
Installation and maintenance of septic tanks is regulated by legislation, sludge is to be pumped out once every 1-2 years.
Installations in restaurants (or similar wastewater installation), a grease trap must be installed upstream (of the septic tank).