Soak-away’s have been revolutionised with the introduction of Aquacell units. These are strengthened plastic cells (1mx0.5mx0.4m) with a 95% void capacity (holds 190 litres of water). In short, one cell holds the equivalent of a 1.5mx1mx1m traditional gravel-filled soak-away. So there is consequently less to remove and dispose of and less to fill-in. They are installed by digging an appropriate-sized hole, wrapping the unit in membrane to avoid ‘silting’, inserting the unit into the hole, plumbing in pipes and back-filling. These can be used under driveways as they have a vertical load capacity of 17.5 tons/m2.