SB2 No Rock/Gravelless Pipe is a cost effective alternative to traditional leach beds. The product consists of 8" or 10" single wall corrugated polyethylene pipe with specially located perforations wrapped with ADS Drain Guard ® and a non-woven geotextile. It works by allowing waste water to enter one end of the corrugated pipe and stay suspended within the bottom two inches of the pipe. This is where pre-treatment occurs. Once the waste water is filled to the same level as the holes in the sides, it percolates to into the exterior valley. The septic blanket wicks the waste water upwards to the exterior top, allowing for treatment around the entire circumference.
The outside diameter of the pipe provides an equivalent of 2 to 3 square feet of soil absorption area per lineal foot. The location of the drain holes (60 degrees off the bottom center line) provides added sludge storage capacity, which increases retention time. The Drain Guard protective wrap is sonically welded to the corrugated pipe and allows free passage of effluent to the soil while limiting soil particle infiltration.