TEPCO and their contract partners have been fairly secretive about what exactly makes the ALPS system work. While they have provided schematics and some explanation of the systems processes, they have not said what filtration materials are being used in the systems.
Finnish company Fortum has been providing ion exchange materials to Fukushima Daiichi since 2012. In their recent press release they explain what some of those filtration materials used in ALPS are.
A proprietary ion exchange material called Nures® includes three proprietary ion exchange materials
CsTreat® removes cesiums
SrTreat® removes strontium
CoTreat® removes cobalt
If you are unfamiliar with ion exchange materials, Wikipedia has a good explanation
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