No-Purge Sampler Comparison

No-Purge samplers, also known as grab samplers, collect groundwater water from a discrete depth without introducing sample biases from pumping or purging. Use where standard purging technology is either not efficient or impractical. These Solinst samplers are portable and have no power requirements.

For representative samples, always lower and steadily raise grab samplers slowly to prevent agitation (reduce turbidity and aeration).

Model Number & Groundwater Sampling Device

428 BioBailer™

428 biobailer

429 Point Source Bailer
429 point source bailer

425 Discrete Interval Sampler
425 discrete interval sampler

425-D Deep Sampling Discrete Interval Sampler
425-d deep sampling discrete interval sampler
Sampler Materials
  • Biodegradeable PVC
  • 316 Stainless Steel Body
  • PTFE Check Balls
  • 316 Stainless Steel Body
  • PTFE & polypropylene check balls
  • LDPE tubing or PTFE tubing
  • 316 Stainless Steel Body
  • Delrin piston • Vyon filter
  • LDPE tubing or PTFE tubing
Standard Sizes & Volumes
  • 3/4 & 1.5" diameters
  • 3 ft length
  • 200 - 1025 mL
  • 0.5, 1, 1.5, & 2" diameters
  • 2, 3, & 4 ft lengths
  • 50 - 1930 mL (1 - 10 lbs)
  • 1, 1.66, & 2" diameters
  • 2 & 4 ft lengths
  • 190 ml - 1800 mL (16 - 29 lbs)
  • 1.66" diameter
  • 2 ft length
  • 420 ml
Sampling Depths
  • <7.5 – 30 m
  • <25 - 100 ft
  • <7.5 – 60 m
  • <25 - 200 ft
  • <7.5 – 90 m
  • <25 - 300 ft
  • <50 – 1200 m
  • <160 - 4000 ft
Operation Overview
  • Bottom check ball only, seals upon retrieval
  • Disposable
  • Disposable, or dedicated
  • Top trigger check ball & bottom check ball, both seal upon retrieval
  • Reusable
  • Pressure activated
  • Top check ball (floats) & bottom check ball (sinks), both seal upon lowering & retrieval
  • Reusable
  • Pressure activated •
  • Pressure acts on the top of a piston (larger surface area) overcoming the hydrostatic pressure acting on the bottom of the piston (smaller surface area) to allow sample to enter
  • Reusable
When Lowering Sampler:
  • Water flows through sampler
  • Water flows through sampler
  • Water does not flow through sampler
  • Water does not flow through sampler
When Retrieving Sampler:
  • Bottom check ball seals upon retrieval
  • Transparent body allows you to check bailer contents
  • Both check balls seal upon retrieval
  • Top trigger check ball adjusts sample flow
  • Both check balls are sealed before retrieval (pressure activated)
  • Sample retrieval device controls sample flow
  • Sampler is vented and piston seals before retrieval
  • Pressure controls sample flow