Released Feb. 2006
Zone Isolaton Sampling Technologies (ZIST™)

ZIST eliminates drawdown, and reduces purge volume as a result of sampling mechanism. When 3-5 wet casing volumes are required, purge volume is reduced by as much as 60% by ZIST displacement systems.

Zone Isolation Sampling Technologies (ZIST)™ In-Line Systems (patent pending) isolate the well screen to improve data quality, minimize cost, and reduce sampling time. BESST's pumps dock with the ZIST™ Well Screen Receptacle located between the well screen and riser pipe and draw samples only from the well screen.

For 'no-drawdown' low-flow sampling and fast parameter stabilization, pumps do not draw stagnant water from the riser pipe above the screen. Miniaturization of well systems reduces the cost of system components, drilling, installation, and operation over time.

ZIST™ Wells provide verifiable isolation of the well screen when the pump is docked in the Well Screen Receptacle located between the well screen and riser pipe. The pump can easily be removed for maintenance, pumping tests, or use of other monitoring devices.ZIST Features:

For more detail information about ZIST Systems(PDF):

• In-Line Well System: For New Wells (63kb, pdf)
• Retrowell System: For Existing Wells (107kb, pdf)
• Multilevel System: For Simultaneous Samplings (67kb,pdf)
• ZIST with Integrated Sensor Technologies (52kb,pdf)

Photo Gallery for ZIST: "See pictures"