PIPESLEEVE from Eljen
Keep underground drains clear for maximum performance and longevity. PipeSleeve separates soil from groundwater preventing sediments from clogging perforated drain pipes.
• Buy Factory Direct—Commercial quality, consumer pricing,
  inexpensive shipping!
• Constructed from the same industrial-grade Geotextile Fabric
  used in the Eljen GSF and PDS systems. Extremely rugged and
  durable—will outlast and outperform homeowner-grade products
  for years to come.
• Slides on so smoothly, it's easy for only one person to install.
• Eliminates gravel backfill—saves installation time and materials.
• Prevents costly maintenance and early replacement of drainage
  system.
• Eliminates waste—cut it from bulk rolls to exact lengths needed.
• Available to fit 4", 6" and 12" diameter perforated pipes in 50' and
  100' rolls, or it can be ordered in custom widths and lengths.