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SomethingOrOther-
I met these guys at a race I've not used them yet but they seem rated
https://www.precisionhydration.com/sweat-testing/our-sweat-tests/
Retro_Bastard
No but if I’m doing a hard session I use the super salty precision hydration 1500 stuff, I also used a bottle of it in double concentration last year during my Ironman to counteract the fact Maurten has not electrolytes..