Septic tanks provide primary biological treatment to crude sewage in normal domestic environments. Solids are retained and settled, then partially broken down by biological action leaving the remaining liquor to flow through the outlet. This effluent is sufficiently treated to soak into the ground in an underground distribution system. Balmoral provides a wide range of sewage treatment plant from septic tanks for a household of four people right through to a full wastewater treatment plant for up to 96 users