septic tankTwo metres deep, 880 litres capacity - there are two of these: one for the black water and one for the grey water. The interior walls have been waterproofed with bitumen paint. Note that each toilet has it own separate entry. This avoids the need of breather pipes or vacuum release valves.
This is NOT a soak-away pit - the floor is 4" waterproof concrete. The black water is drained to the second identical septic tank before being evacuated to the leach field. The grey water first goes through a grease trap.jazzman
Septic tanksDouble-chamber septic tanks with leech system. Our substrate is hard clay and does not percolate to allow seepage tanks. The two in the picture serve two rooms; there will be an identical installation at the other end of the building for the other two rooms and the outside WC/shower and laundry room. Black water flows into the first tank which overflows into the second tank. Grey water goes directly into the second tank. There are no kitchens so a grease trap is not required.jazzman
