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Diving doubles under 30m? I kinda think you'll want Trimix at some point to go deeper. There's many a thread about 40m or even 50m without Trimix, but there are definitely drawbacks. Whether they're worth the cost savings is a personal call. My vote would be Trimix (and therefore the Teric).I don’t plan on using trimix, just nitrox and twin 10L tanks for the next two years