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is there a stepping path from used granule to used granule
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This is a very interesting concept that I'd not thought about - due to the porousity of the material a "dead" granule is effectively a non-absorbing channel, and if they're orientated such, could provide a channel all the way through.
I was still toying with the idea of a Hyperfcapnia hit in the lounge to see what it feels like until a diving doctor mate (ChrisP) made the analogy of this and a Hypoxia simulation to the film
Flatliners, and since then, I've been not so keen to try!
At the end of the day I'll put fresh stuff in, but I'm the kind of person who likes to know all the why's and wherefore, and try to understand exactly what's happening.