Types of Disposal Fields

Stone and Pipe Leach Fields

An effluent disposal method utilizing perforated PVC pipes typically 3' to 5' on center in a contiguous area of septic stones. This area is of shallow construction and typically 15 to 30 feet wide and 30 to 50 feet long. The actual size of the field is determined by the loading in gallons per day and the ability of the soil to filter the effluent.

Chamber Systems

An effluent disposal system made of either concrete or plastic units that are perforated with open bottoms. These units are interconnected in various configurations and provide storage space for effluent and mechanical support for the soil above. The state of NH will allow a significant reduction in required size for this type of system. Concrete chambers are typically 4' x 8' or 4' x 12' and laid out in a rectangular configuration; They can be purchased with enough strength to drive or park vehicles over them. Plastic chambers are arranged similar to the concrete in a clustered design, with rows usually tight against each other.

Fabric Based Systems

There are basically two types of fabric based systems, tubes and modules. The first would be an effluent disposal method utilizing 12" diameter corrugated plastic tubes wrapped in a filter fabric and installed in many different configurations. The length of rows and spacing is dependent on the existing soil quality, slope, and loading. These types of systems work well with sloping terrain and also are awarded a significant reduction in size from the stone and pipe type systems. Two popular brands or manufacturers of filter tube systems would be Enviro-Septic and Geoflow. The modular system would be the Eljen In-Drain. Each modular unit is a biofabric filter in a rectangular mattress-type shape. These units are placed end to end in rows and covered with a filter fabric.

ATUs : "Aerobic Treatment Units"

Also known as treatment tanks, ATUs are a option used primarily for a problem site with area constraints and close proximity to wetlands. This system pre treats the effluent and allows a much smaller disposal field. This is usually done with an "aeration tank" meaning a tank in which wastewater is brought in contact with air for the purpose of facilitating biological degradation. This type also requires regular service and maintenance. Two popular manufacturers of this type are SeptiTech and 'The Clean Solution'.

Designs Offered

  • Traditional Stone and Pipe
  • Enviro-Septic
  • Geo-flow
  • Concrete Chambers
  • Eljen In-Drain
  • Infiltrator Systems
  • The Clean Solution Alternative Systems
  • Septi-Tech Zero Pollution Waste Water Systems
  • Pump Systems

Septic System

A septic system is also known as a individual sewage disposal system. This means all the components used to receive and treat sewage and other wastes. Components include the septic tank and disposal leach field systems with various methods of distributing the effluent.

Septic Tank

A septic tank is typically a pre-cast concrete rectangular chamber that receives raw sewerage. The purpose of the septic tank is primarily storage and settling. The bigger and 'quieter' the tank, the better the settling process. A two compartment tanks help decrease the amount of solids that could reach the disposal area by allowing additional settling. Some anaerobic (without oxygen) treatment takes place in the tank making it easier for the soil to digest the effluent in the aerobic (with oxygen) environment when it reaches the disposal field.