High pressure, but new column.
I'm using the CORTECS UPLC Shield RP18, 90 Å, 1.6 μm, 2.1 × 100 mm (p/n: 186008694) with the exact same application method published by Waters for CBD, but im getting pressure over 15,000 when running at 0.7 ml/min (as published) even before injecting samples. My system runs at 980 psi when running with a union instead of a column at 0.5 ml/min. I think that's somewhat normal without the column. It is frustrating to have to run at a lower flow rate than normal despite having a new column. Any thoughts?