FEP-lined tubing is polyethylene tubing lined with FEP fluoropolymer. It is resistant to virtually all solvents and is extremely chemically inert, making it great for testing the purity of groundwater. FEP-lined tubing ensures confidence that any contaminants found in groundwater, came from the groundwater.  You can also be sure that the groundwater won’t contaminate the tubing, allowing it to be washed and reused, as needed.