The KISSS Below Flow Flat subsurface irrigation system works by pulsing water through the lateral lines for several minutes a few times a day at a very low pressure between 6 and 32 psi. The water running through the lines disperses out the pressure compensating emitters, hits the dispersion tape and then is absorbed by the patented capillary fiber. Lateral percolation is reduced due to the polyethylene backing that is exclusive to the Below Flow Flat. This then allows the soil to absorb the water from the capillary fiber at its own rate based on the soils need for water.

Polyethylene dispersion layer: The tape on top of the product acts as a boundary between the soil and the emitter. It forces the water to absorb into the capillary fiber before absorbing into the soil. This eliminates water tunneling to the surface creating wet spots.
Capillary Fiber: Allows soil to take water from an infinite number of absorption points instead of a single point source. The water races along the capillary fiber 30,000 times faster than in soil and then transfers into the soil by capillary action. The fiber also maintains perfect moisture uniformity along its length.
Pressure compensating drip tape: Delivers water to the geo-textile fiber at certain pressure ranges when system is on or "engaged".
Anti-percolation layer: Prevents downward percolation of water minimizing water loss. The backing forces the water to move upward into the soil instead of immediately leaching downward keeping the water in the root zone.