A septic tank generally consists of a tank (or sometimes more than one tank) of between 1000 - 7500 litres (1,000 and 2,000 gallons) in size connected to an inlet wastewater pipe at one end and a septic field drain at the other. The design of the tank usually incorporates two/three chambers (each of which is equipped with a manhole cover) which are separated by means of a dividing wall which has openings located about midway between the floor and roof of the tank
Some systems require emptying every few years or sooner, while others may be able to go 5–10 years between cleaning. Contrary to what many people believe, there is no “rule of thumb” for how often tanks should be emptied.
Some older Fincas in Spain have a “posa negra” or black hole, literally a hole in the ground. The waste is allowed to seep away into the soil. This is against EEC regulations and a proper tank needs to be installed. The issues associated with septic tanks are not many but when they go wrong they can be expensive to rectify.
The main problems are, the tank moving when it isn’t laid on a concrete base, causing the tank to move and the pipes to come apart. More seriously when the tank isn’t emptied, the pipes can block, resulting in the pipes needing to be either broken open or replaced.
LT Construction has also pioneered here in Andalusia the use of adding an additional filtration tank for using the waste water to irrigate the garden. If you would like to discuss these issues, call us today.