DGSI. Durham Geo Slope Indicator

Mini Bladder Pumps (MBP)

Specially designed for low flow sampling.


Low flow ground water purging and sampling
1/2 inch and larger-diameter Sch 40 wells



The MBP pumps consist of:
PVC or Stainless Steel (SS) outer body
• Teflon bladder
• ½, ¾, 1, 1.3 and 1.66 in dia.

Selection table >>
Testimonial >>

The pneumatic Mini Bladder Pumps are designed to obtain a representative ground water sample with the assistance of a controller to provide variable flow rates. The controller allows the user to match the pumping rate to the well recharge rate, limiting the stress on the formation. With the small volume per cycle, the fluid velocity at the pump inlet is substantially reduced, making the pumps ideal for low flow sampling. The high efficiency design enables pump rates from 5 mL to nearly 2 L/min when used with one of our Precision Dual Range Controllers. The 1.66 in diameter pump will produce flow rates up to 2 gpm.

Tech Tip: The amount of pump submergence will affect the pump flow rate. Pump curves were developed with 10 ft submergence.

The bottom inlet of the pump is positioned at the desired sampling point, generally at the mid section of the well screen. The inner Teflon® bladder will fill with fluid based on the submergence of the pump. The annular space is pressurized using the controller and the liquid is gently lifted to surface. All pumps can be supplied contaminant free.

Tech Tip: In portable applications, the pump is easily decontaminated by submersing it in a cleaning solution such as Alconox®. Then the pump is cycled to circulate the solution through the internal components. This method avoids the need to replace bladders after each use.

Dedicated assemblies can be supplied to reduce cross contamination, well disturbance and facilitate installation. The pump, tubing and well cap assemblies are plastic bagged and each assembly is identified with your well ID number and the well depth.

Tell us your requirements by filling our Sampling Pump Requirements Form (PDF, 110 KB).

Model Description


MBP Bladder Pump, 1/2" x 18"


MBP Bladder Pump, 3/4" x 18"


MBP Bladder Pump, 1" x 18"


Related items:
Mini PVC Bladder Pumps
Precision Dual Range Controller

> Full-Size Pneumatic Bladder Pumps
For applications that require higher flow rates, full-size bladder pumps are available with stainless steel, Teflon, or PVC bodies. The pumps fit 2-inch or larger wells, work to depths of 200 feet, and provide flow rates of up to 2 gpm.

> Locking Caps
Locking caps provide a convenient way to suspend bladder pumps in dedicated installations. The cap has an expandable gland that holds it firmly in place and seals the well to prevent entry of surface water or contaminants. The cap includes connections for a stainless steel suspension cable and fittings for tubing from the pump. A 0.75 inch port allow a water level probe to pass through so that water level measurements can be made.

Model Description


2" Locking Well Cap


4" Locking Well Cap


For more information

Catalog pages (PDF, 329 KB)
Air Flow and Pressure Loss table (PDF, 255 KB)
Water Flow and Pressure Loss table (PDF, 241 KB)



ISO 9001:2008     C2015-01879