FAQ ABOUT REBREATHERS
Yes, Sofnolime™ 8-12 Mesh NI (Grade 797) is currently the best granular option for your Dive Rite O2ptima, Poseidon VI or Se7en, and rEvo CCRs.
The Dive Rite models with the 2015 packable/EAC scrubber can accept either granular or Extendaire cartridge, earlier versions can only accept the Extendaire cartridge. The Poseidon models originally used a Molecular cartridge that is no longer available, and now require a self packable granular adapter. The rEvo only accepts granular for the self packable cassettes used in its dual scrubber system.
The primary difference today from the user standpoint is that the Poseidon Se7en+ electronics module has been updated to include native support for Poseidon's optional Solid State Oxygen Sensor. Due to improvements in gas injection the Se7en+ design now requires three instead of four solenoids, theoretically improving reliability by reducing parts count. There also are some internal differences that make the e-module easier to manufacture, assemble and service at the factory. Support for granular absorbent (in the form of a self-pack cartridge) is also now included as standard on the Se7en+ model, as the pre-pack cartridge has been discontinued.
Open circuit divers considering transitioning to closed circuit diving need basic information about rebreather equipment and safety, course descriptions, costs and logistics. Without getting bogged down in too much detail, the best place to start may be to read our article Closed-Circuit Rebreather Instruction.
The digital solid state oxygen sensor (SSO2) is not a plug compatible replacement for the analog oxygen sensor and so currently only Poseidon devices can use the SSO2. To adapt the SSO2 to other brands of rebreathers would need a method to physically plumb the SSO2 in to the loop for monitoring using the Poseidon M28 dive computer, or a major revision to the rebreather controller electronics. For obvious reasons, Poseidon is not in a position to modify other brands of rebreathers. However, Poseidon is actively promoting their SSO2 technology to other rebreather manufacturers and we are aware that several rebreather manufacturers are looking at methods to provide one or the other solution, or both, as options.