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CCR Diluent Selector

Suggests viable diluent gas options for CCR. Balances loop PO₂ control with open-circuit bailout survivability across your dive profile.

Part of the Dive Tools toolkit by Chris Uriarte

Units
Dive Profile
Mixes with O₂ below this value are flagged as non-optimal.
Mixes whose flush margin falls below this value are flagged as non-optimal. “No margin” disables the check entirely.
Narcosis & Density Constraints
30 m
Helium fraction will be set to hold END at or below this limit. Set to max if you don't want a trimix option.
Diluent Options
Assumptions & Notes

THESE TOOLS ARE FOR REFERENCE PURPOSES ONLY. USE AT YOUR OWN RISK. Always plan dives with a qualified instructor and dive agency standards.