I suppose most of you have experience with training or racing under ‘extreme conditions’. I’ve been using PH for a while and during my ‘Giro d’Italia’, at some stages with hefty climbing, I was consuming one 500 ml bottle with a PH 1000 tab, every kilometer or so…
My intention is not to promote PH, as there are other alternatives, but the article is informative: https://www.precisionhydration.com/blogs/hydration_advice/maintain-performance-in-extreme-heat