DESIGN AND PERFORMANCE CRITERIA

• FLOW--The minimum sized filter shall provide a minimum clean water flow rate of 4.2 gallons per minute when tested in a setup that places the filter in its operating position and the clean water head is at the center of a 4" sewer line at the septic tank inlet.
• FILTER AREA--Specify total filter surface area, in square feet, (filter solid area plus filter void area)
• FLOW AREA--Specify filter open area, in square feet, (filter void area only)
• FILTRATION--filters shall prevent solid particles larger than a nominal 1/8" diameter sphere from passing through the filter.
• CLOGGED FILTER BY-PASS PROTECTION--there shall be no bypass capability designed into the filter which will allow waste to be discharged.
• FILTER CONSTRUCTION--Openings developed by penetration, sawcut, or equivalent shall be process controlled and all mold flash and penetration burrs removed. The filter shall be secured so that inadvertent movement does not take place during operation.
• STRUCTURAL INTEGRITY--the filter shall be designed such that the filtering medium maintains structural integrity throughout the useful life of the device. The filter medium shall not tear or otherwise distort so as to make the filter inoperable during normal operations of the septic tank.

OPERATIONAL VERIFICATION--The manufacturer shall provide results of field testing for their product(s) being considered for approval.
DRAWINGS--Manufacturer shall provide drawings to the Department with the written request for product approval submittal. Drawings shall show all dimensions.
FREQUENCY OF MAINTENANCE--Manufacturer shall provide data and information reflecting actual operational experience related to the frequency of necessary unit maintenance to keep the unit functional and shall specify the recommended method and frequency of maintenance.
INSTALLATION INSTRUCTIONS--Manufacturer shall provide installation instructions to the installer.
MATERIALS OF CONSTRUCTION--the filter shall be constructed of proven corrosion resistant material for use in wastewater environments.
MAINENANCE ACCESSIBILITY--64E-6.013(3)(b), FAC requires accessibility to the inlet and outlet devices. When outlet filter devices are used, this rule shall include convenient accessibility to the filter for maintenance through service manholes or equivalent.
CERTIFICATION TO DEPARTMENT OF HEALTH, ONSITE SEWAGE PROGRAM--The manufacturer shall certify to the Department that the filter(s) meet the requirements of this standard.
FILTER APPLICATION--Filters shall be sized in accordance with the manufacturers' recommendations for the service intended.

Please address any questions to Dr. David Lindbo.

This page (http://www.ces.ncsu.edu/plymouth/septic/98booher2.html) created by
Vera MacConnell, Research Technician, I on February 1, 1999.
Last Updated on 7/17/00 by Roland O. Coburn, Research Tech. I