Quote:
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Carbon Dioxide CO2 absorbent (apparently soda lime) is provided in flat cans with small circular "knock outs" top and bottom. Several cans may be seen on Photograph No. 32. When the purifiers are to be used, the circular "knock outs" are removed and the cans are inserted in rack manifolds connected to the suction side of the ventilation system.
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This is a quote from the report on capturing U570.
I found photo 32;
So there it is, they certainly are potash-cartridges for scrubbing CO2