Each RainXchange™ Water Storage System Includes: AquaBlox™ Water Matrix® Tanks, 45 mil EPDM rubber liner membrane, and two panels of non-woven geotextile underlayment (one to surround the AquaBlox™ Water Matrix® & one to surround the exterior of the EPDM rubber liner) Note: the 3000 Gallon RainXchange™ Water Storage Systems also includes the Snorkel™ Vault Extension.