Techline CV Pressure Compensation & Continuous Self-Flushing: Dripper is pressure compensating; flushes any debris while operating; water exits the dripper in one spot, but exits the tubing in another, creating a "physical root barrier."
Anti-Siphon 1: How Debris Can Be Pulled In - When Water Shuts Off, the Dripperline Empties, and Unless Properly Protected, Contaminants From the Surrounding Soil Can Be Drawn Into the Tubing Through the Drippers by Suction.
Anti-Siphon 2: How Debris Can Be Pushed In - When Surrounding Soil Pressure Is Higher Than the Pressure in the Tubing, Contaminants Can Be Forced Into the Tubing. This Is Especially Important During Long Wet Periods, or Wintering Over.