The d-Rain Joint Rainwater Filter Drain from Bio-Microbics installs and looks like a standard expansion joint used in concrete slabs, yet it provides a gap slightly smaller than 1” wide that allows water to flow through to subsurface drainage. Available in aluminum or in gray polypropylene, it comes in 8’ lengths and can be installed in concrete or asphalt driveways, sidewalks, and other applications. The d-Rain allows drainage at 2 gallons per minute (gpm) per linear foot, up to a maximum of 5 gpm/linear foot. A replaceable filter keeps debris from entering the channel.
Bio-Microbics Inc.
