@vanbc the assumption of @gcarver on the sodium-citrate is correct. I use 4.5g of sodium-citrate for each gram of sodium, I would like in my drink mix.
I mix my drinkmix with the 2:1 ratio for 80g/liter and 1g of sodium.
This works very well for me, just did a 10.5 hour MTB ride without fueling issues or cramps (added 3 Sweat Tablets from Precision Hydration during the ride).
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