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I've created a GSS using the thermo.com.V8.Rc+.tdat thermo database but want to convert it to the thermo_minteq.tdat. No problem, open -> thermo -> and select thermo_minteq.tdata. Then GWB asks me, through a series of pop up windows, to sort out discrepancies in basis entries. So I start the conversion and, for example for Arsenic, it says AsH3(aq) is unavailable in the new database and suggests I substitute AsO4----. Sure, that's fine, but my AsH3(aq) data are in units of mg/L (as As) in GSS. I want to preserve the same concentration so I can have my new AsO4---- data in units of mg/L (as As). What's strange is that it has a checkbox asking if I want to convert value by elemental equivalent. if I check the box I get what I want - the value stays the same. If i do not check the box, the value is converted to accomodate the difference in unit mass. It seems to me that this should be the opposite - unchecking the box should not do a unit conversion, and checking it SHOULD do a unit conversion. Is this a bug, or do I just have this backwards?