Septic tank size?

The size, style and construction fo your septic tank or cesspit is crucial to its performance. Correct size for a septic tank depends on the number of people using the system, which in turn is determined by the number of bedrooms in the house. The minimum septic tank size for a 4 person household is 2720 Litres, with 180 Litres added for every extra person. If the septic tank size is too small then you are likely to reduce the life of your soakaway system, as the retention time in the tank will be too short and insufficient settlement will take place.
Asked Aug 12, 2017
I have a faulty septic tank. The tank is quite large, approx. 5 x 2 x 1.5, but fills rapidly - in the wet it needs to be pumped out often, sometimes every two weeks, the dry considerably slower. Obviously, ground water must be entering. When operating normally a septic tank should not fill up and, as a guideline, should only need pumping out probably once every 5 years if that. This is a very large septic tank (15 cubic metres, most tanks are only a quarter of this size) and should take a while to fill up. Check once more...
Answered Oct 27, 2020

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.