How much do the O2ptima consumables cost?
As with all rebreathers, the major consumable cost is CO2 absorbent. An O2ptima absorbent cartridge is about $30 and typically can be used for several dives, but there are other smaller costs such as batteries and 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.