Proprietary Leaching Devices

Septic Systems: Disposal Field

Proprietary Leaching Devices

proprietary leaching device is a gravel-less material which is used to create a void area beneath the soil. It replaces the stone and distribution lines in conventional bed or trench disposal areas, although piping is still required for some systems. Each proprietary leaching device is rated by percent equivalence to a stone disposal area system, expressed in square feet. Proprietary leaching devices are pre-manufactured structures of concrete, plastic or other gravel-less material. They are similar to stone beds or trench disposal system, in design, use and function. Installers should refer to the manufacturer's instructions for installation guidance.

The advantages of proprietary leaching devices over the conventional stone bed designs are:

reduced area need for installation by 25% to 75%
reduced fill volumes required for installation
can be removed and reused to create a new system if failure occurs
can be installed without stone, an advantage at remote, hard-to-access sites
can be configured in terraces, stepping down the natural slope of the land
can be manufactured with sufficient strength or designed so that they may be installed under parking lots or traffic-laden areas. (Systems designed for vehicular traffic my have an H-20 lading rate).

The disadvantages of proprietary leaching devices over the conventional stone bed disposal system may be:

a higher initial cost
requirement for special materials or installation techniques

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