Solinst Multilevel System Comparison

Multilevel Drive-Point Piezometer

Solinst has been manufacturing high quality stainless steel Drive-Point Piezometers with single monitoring points for years, and in 2021 developed the Model 615ML Multilevel Drive-Point Piezometer. Stainless steel monitoring ports are connected using 3/4" NPT steel drive pipe and couplings. Dual barb stems allow the connection of 3/8" OD (9.5 mm) or 1/4" OD (6 mm) tubing to create up to 3 or 6 monitoring zones, respectively. Drive-Point Multilevel Systems require very few tools to construct and can be installed simply using direct push methods, including a manual slide hammer. These systems are easy to transport with portable sampling and level monitoring options.


The CMT® Multilevel System

Since 1999, Solinst has manufactured the Model 403 CMT Multilevel System. CMT consists of continuously extruded polyethylene tubing with seven or three separate channels running its length. Monitoring zones are mechanically created and sealed off, one in each separate channel at different vertical intervals. CMT offers in-field design flexibility, is low cost and easy to install. The number of monitoring ports, port locations, install depths, and monitoring strategy, can all be accommodated and finalized on site. The 7-Channel System is 1.7" (43 mm) and the 3-Channel is 1.1" (28 mm). They are ideal for shallow applications in narrow diameter boreholes.


The Waterloo Multilevel
Groundwater Monitoring System

Solinst has manufactured the Model 401 Waterloo Multilevel System since 1984. The System uses modular components of various casing lengths, sampling ports, and optional packers that are connected to form a sealed casing string. This design gives excellent flexibility, allowing placement of ports and packers to suit borehole logs. Pumps and/or transducers can be dedicated to each port. All instrument tubing and cabling is contained within these modules and collected at the top of the system at a wellhead manifold. The Waterloo System is ideal for longterm monitoring in bedrock and cased boreholes, and has been used to depths of 1000 ft. (300 m).


  Multilevel Drive-Point Piezometer CMT System Waterloo System
Ideal Depth 3 ft – 20 ft
(1 m – 6 m)
20 ft – 150 ft
(6 m – 50 m)
100 ft – 1000 ft
(30 m – 300 m)
System Diameter 3/4" (19 mm) ID 7-Channel: 1.7" (43 mm) OD
3-Channel: 1.1" (28 mm) OD
2" (50 mm) OD
Typical Installations
Overburden 3/4" (19 mm) ID installation with direct push or manual slide hammer >3.25" (8.3 cm) dia. (direct push, hollow stem auger, sonic drilling) >5" (12.5 cm) dia.
Bedrock n/a >3.25" (8.3 cm) dia. 3" (7.6 cm) to 4" (10 cm) dia.
Isolating Zones
Engineered Packers n/a 3-Channel
Layers of Sand and Bentonite n/a
Direct Burial n/a
Max # of Sampling Zones 6 7 24
Soil Gas Monitoring
Measuring Depth to Water
<20 ft (6 m) below ground 102 Water Level Meter 102 Water Level Meter 102 Water Level Meter
>20 ft (6 m) below ground n/a 102 Water Level Meter 102 Water Level Meter or Pressure Transducer
Groundwater Sampling
Dedicated n/a
  • 1/4" Mini Inertial Pump
  • 3/8"DVP
  • Bladder Pump
  • 5/8" DVP
  • 410 Peristaltic Pump
  • 410 Peristaltic Pump
  • 403 404 1/4" Mini Inertial Pump
  • 408M 3/8" Micro DVP
  • 410 Peristaltic Pump
  • 403 404 1/4" Mini Inertial Pump
  • 408M 3/8" Micro DVP
  • Base flow monitoring in stream beds
  • Soil gas sampling
  • Sparge points
  • Low cost, minimal disturbance site assessments
  • Surface water/ groundwater interaction investigations
  • UST monitoring
  • Vapor monitoring
  • Submarine discharge monitoring
  • Monitoring in high water table environments
  • Dewatering impact assessments
  • Mass transport and mass flux calculations VOC, MTBE and Perchlorate monitoring at NAPL sites
  • Monitoring salt water intrusion
  • Install at industrial cleanups
  • Investigate pipeline leaks
  • Dam leakage/rehabilitation
  • Contaminant identification/cleanup at DNAPL & LNAPL spill sites
  • Monitoring waste disposals/landfills
  • Performance monitoring of pump and treat systems