w ripley
Contributor
I am curious why anyone would u$e a Trimix above 21% rather than EAN. Is it an issue with available tables/decompression algorithms?
There are some who will blend HE in their deco mixes to address isobaric counter diffusion. I know divers who are greatly concerned with ICD when diving very deep with extended bottom times. If I'm diving deep I will add HE to my 70 foot bailout, for example, as everything up to that point is usually 21% O2 or less. I've never had ICD issues, and know there is always a ICD debate going on in some diving forum about it, but it's they way I've been diving for years and figure a little HE buffer at the 70-foot stop isn't necessarily a bad idea.