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Thank you for your answers If so, diffrent certifications (as in different enrichment precentages) are only kind of a business plan?

Hello everyone, Why is it that SSI Nitrox certification is "only" up to 40% as opposed to PADI's up to 50% enriched air as advanced certification. The questiob may be sound a bit stupid but I can't really understand why SSI are not offering the more flexible certification. Further more - would...