I have a quick question for you folks who analyze a lot of waters. Have any of you experienced slow equilibration kinetics between water and CO2 when using ultra-pure water? ******************************** Steve Nelson Dept. of Geology S389 ESC Brigham Young University Provo. Utah 84602 voice: 1-801-378-8688 lab: 1-801-378-5124 FAX: 1-801-378-8143 CONTROL, ALT, DELETE: the 3 most frequently used keys on a PC. *********************************