There Are a Few Pump Options for Sampling 2-Inch Monitoring Wells
Sampling a 2-inch groundwater monitoring well requires choosing the right environmental sampling pump, one that delivers reliability, accuracy, and compliance with low-flow sampling standards. While several pump technologies are available today, a few stand out as the most practical and widely used. Below is an overview of the primary options used by environmental professionals nationwide, including the industry-leading MP 1 pump, 12-volt submersible pumps, and bladder or double-valve pneumatic pumps.
1. The Most Common Option: The MP1 (Royal Eijkelkamp Redi-Flo2) Pump
For decades, the MP1 pump, formerly known as the Grundfos Redi-Flo2 and now rebranded as the Royal Eijkelkamp MP1/Redi-Flo2, has set the standard for low-flow sampling in 2-inch monitoring wells. Although the name has changed, the performance has not. Environmental professionals can expect the same:
- Reliable low-flow sampling
- Precise flow control using a frequency converter
- Durable stainless-steel construction
- Ability to sample from deep wells: up to 275 ft TDH (comes with up to 300 ft of cable)
The adjustable frequency inverter gives technicians full control over pumping speed, from purging at higher flow rates to dialing down to steady, low-flow sampling. Built-in safeguards protect against overload, overheating, and voltage issues in the field. The MP1 remains the most trusted choice for deep wells and applications where sample integrity is critical.
2. 12-Volt Pump Options for Shallow Wells (≤200 ft)
For wells under approximately 200 feet, lightweight 12-volt submersible pumps are often a faster and more economical option than the MP1. These pumps are simple to use—just connect to a 12V battery—and are ideal for purging or low-flow sampling when paired with the correct controller.
Proactive Environmental Products 12V Pumps
Proactive’s pumps are widely used due to their portability, ease of setup, and consistent performance. They are available in PVC and stainless steel (SS) models, and importantly, are certified PFAS-free, reducing the risk of sample contamination.
Common models include:
- Mini-Typhoon / Cyclone
- High-performance pumps like the Monsoon, Hurricane, and Mega-Monsoon
- Stainless steel versions for improved decontamination and durability
Key benefits include:
- Fits standard 2-inch wells
- Fast setup, often under 60 seconds
- Can operate in high-turbidity environments
- Stainless steel options with replaceable motor modules
- Compatible with low-flow controllers for precise sampling
Proactive pumps are an excellent choice for routine monitoring events, short-term projects, and wells where portability matters.
Whale® 12V Water Pumps
Whale Water Systems also provides compact 12V sampling pumps suitable for shallow wells. These pumps offer a lightweight, field-friendly design and are often used as an economical alternative when moderate flow rates are acceptable.
3. Bladder Pumps and Double-Valve Pumps (Air-Driven)
Although less commonly used than electric submersible pumps, pneumatic bladder pumps and double-valve pumps remain essential tools, especially when sample integrity and VOC preservation are top priorities.
Solinst & QED Bladder Pumps
Bladder pumps from Solinst (407) and QED MicroPurge/Sample Pro deliver:
- High-quality samples with no air/water contact
- Excellent VOC retention
- Low-flow sampling control down to 100 mL/min or lower with the proper controller
- Field-serviceable bladders (PTFE or polyethylene)
- Rugged stainless-steel construction
Because compressed air drives the pump, water is gently pushed to the surface without turbulence, ideal for low-flow sampling and regulatory compliance (including EPA VOC standards). These pumps can operate at depths up to 500 ft depending on the model.
Solinst Double Valve Pump (408)
The Model 408 DVP offers similar VOC protection to bladder pumps, but relies on dual check valves instead of a bladder. Benefits include:
- Higher pumping rates when needed
- Excellent performance in wells with higher solids
- Suitability for leachate or product recovery applications
- Easy decontamination and field servicing
Both bladder and DVP systems require two tubing lines; one for drive air and one for the sample line.
Why Rent from Environmental Equipment & Supply?
Selecting the right pump for a 2-inch monitoring well ultimately depends on your project’s depth, sampling requirements, and data quality needs. Whether you need the trusted performance of the Royal Eijkelkamp MP1/Redi-Flo2 pump, the portability of a 12V Proactive, or the precision of a Solinst or QED bladder system, today’s environmental pump options offer reliable solutions for nearly every groundwater application.
If you’re unsure which pump is the best fit for your next sampling event, Environmental Equipment & Supply is here to help. Our team can recommend the right equipment based on your well construction, sampling depth, and regulatory needs and we keep a full inventory of rental and purchase options ready to ship.
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