3-channel CMT Sand
and Bentonite Cartridges
For direct-push installation of the 3-Channel System, the annulus available is often too small to accurately place sand and bentonite layers. Therefore, bentonite cartridges have been developed to give reliable seals between zones, and accompanying sand cartridges to complete the installation.
These cartridges are approximately 2.4" (61 mm) in diameter and will fit inside various direct-push drill rods. Ideally, the borehole diameter these bentonite cartridges are used in should not exceed a nominal 3.5" (90 mm), to ensure proper expansion and sealing.