What is a Package Treatment Plant (Biodisk/Biobubble)?
These also work by allowing the natural bacteria to break down the sewage. They are similar to septic tanks but usually include some means of stirring the sewage or adding air to the effluent so that the bacteria can break it down more effectively. Because of this they often require a power supply. They can provide a good quality effluent which is far easier to discharge. This means they are better suited to more environmentally sensitive areas and should be considered before a septic tank or cesspit. Percolation Tests Sometimes the surrounding ground is not suitable to allow effluent water to soak away. The soil may not be permeable if there is a lot of clay. Percolation tests need to be carried out to ensure that the water can be harmlessly disposed of from a septic tank or a similar installation. The tests should be carried out following BS6297: 1983 to determine the size of the soakaway. They must be sited 6 meters from a water course. It may not always be possible to install soaka
