This keyword data block is written by the DUMP operation. It is intended to be used to reinitialize simulations at the point that the DUMP command was executed, or to transfer exchange-assemblage compositions between IPhreeqc modules.
The EXCHANGE_RAW data block contains a complete listing of the internal data structures that define an exchange assemblage. EXCHANGE_RAW data blocks are written by DUMP and read by PHREEQC without user modification. The formats should be considered dynamic because future modifications to PHREEQC could result in additional data that are included in the EXCHANGE_RAW data block.
EXCHANGE and EXCHANGE_MODIFY.