The 0.85" Geotech Portable Bladder Pump is the narrow-diameter option for 1" monitoring wells and tight casings where a 1.66" pump will not fit. Stainless steel body with a quick-change bladder.

A bladder pump keeps drive air completely separate from the sample — compressed air squeezes a flexible bladder, and only the bladder contacts the water. That isolation is why bladder pumps are the reference method for low-flow (micro-purge) sampling: volatiles are not stripped and turbidity stays low.

Choosing your configuration

• Standard or drop tube. A drop tube intake draws from below the pump, so you can sample near the base of the screen without repositioning the pump body.
• Standard or PFAS-free. PFAS-free units use documented fluoropolymer-free wetted materials for programs where PFAS is an analyte. Same price as standard.

Building a complete 0.85" system

A working setup needs four things beyond the pump:

1. GeoControl Pro controller — drives the pump and sets the cycle timing
2. 0.85" bladders — PTFE or polyethylene; replaced between wells
3. 0.675" & 0.85" bonded tubing — air and discharge in one bonded run
4. GeoReel — the hand reel covers both 0.675" and 0.85" pumps

Everything compatible with this diameter is gathered in the 0.85" Bladder Pump System collection.

Specifications | Installation & Operation Manual