As with all rebreathers, the major consumable cost is CO2 absorbent. An absorbent cartridge is about $35/€32 and typically can be used for several dives, but there are other smaller costs such as gas fills. Keep in mind that for both open-circuit and rebreather divers, consumables costs are usually insignificant in relationship to the investment in the equipment, training and other diving costs such as boat charters and travel.
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