Underliner Vent System, 150 foot roll Koi Ponds & Water Gardens (Air Systems) 2 Blue (medium) Matala Filter

2 Blue (medium) Matala Filter Pad and 6 mesh bags for filter media (not included - use about 1 cubic foot per mesh bag)

GreenClean works through oxidation

when the water temperature goes above 50°F

Available in Black

2 year warranty

Underliner Vent System, 150 foot roll Koi Ponds & Water Gardens (Air Systems) 2 Blue (medium) Matala FilterThis 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