This Underliner Vent System helps protect pond liners from damage caused by methane gas and water accumulation beneath the liner. It is a prefabricated 6 inch strip consisting of a molded grid wrapped in geotextile fabric to permit a high flow of water into the grid while restraining soil particles. By simply laying a strip of Underliner Vent on the ground before installing the liner you can prevent costly future problems. This easy to install system is effective, low cost and best of all does not require cutting the liner. With the Underliner Vent System neither water nor air can build up pressure under the liner. Instead it will vent through tubes to the outside of the pond, where you can connect the 4 inch End Outlet piece, sold separately.
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