Define a new exchanger with a new name and it should work. X has too much baggage in the databases. Example uses Z; any unique alphabetic string can be used; first letter must be capital. EXCHANGE_MASTER_SPECIES Z Z+ EXCHANGE_SPECIES Z+ = Z+ log_k = 0.0 HCO3- + Z+ = HCO3Z log_k = 0.9 TcO4- + Z+ = TcO4Z log_k = 0.9 EXCHANGE 1 Hypothetical ion exchanger HCO3Z 0.24 END David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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