I know this is Tailwind country... but I've been using this for about half a year now. Basically, I sweat a lot, especially when it's warm. So even if I'm feeling great and not getting fatigued, I'm still dripping with sweat.... I mean, my helmet straps and backpack look like they were dipped in the salt lake. I also would drink a ton of water on rides, and come back feeling super dehydrated. This stuff seems to be pretty effective. I used to almost drain a camelback by the time I got to the top of Monroe TT, now I drink maybe half? Keeps the post ride headaches away too. It's basically a saline solution with salt evaporated from Utah. This does make the water extra salty tasting... but i found ice cubes make it better for drinking. I put about a tsp into a 64 oz bladder. No film left over or anything, so great for putting in camelbaks etc. I'm pretty happy with it. It will probably take a while for me to go through the whole bottle, but all the talk of tailwind has me curious about that stuff too... anyway.. https://eletewater.co.uk/ I got my bottle on amazon.