April 2026: Marathon season is coming to its peak, and whether you're a seasoned pavement-pounder or a first timer chasing a personal best, months of hard training come down to one thing: how well your body performs on the day. Training schedules, kit choices and nutrition plans dominate pre-race conversation, but one of the most fundamental elements of strong athletic performance is consistently overlooked: water quality.
Water makes up approximately 60% of the human body, and even mild dehydration can impair endurance and reduce concentration. For marathon runners, proper hydration is key to a smooth race. Water filtration experts Tappwater suggest runners look beyond the tap and plastic bottles to consider the quality of water going into their bodies, swapping standard water to filtered water.
Water filters remove over 100 unwanted substances from tap water, including chlorine, chloramines, microplastics and heavy metals while retaining the beneficial natural minerals that support bodily function. The result is clean, great-tasting water straight from the tap, without the cost or environmental waste of single-use plastic bottles.
For runners who love electrolytes in their water, the same applies. The smarter, more controlled approach, according to Tappwater, is to use electrolyte tablets or drops added directly to filtered tap water. Mixing electrolytes into unfiltered tap water means adding those much-needed minerals into a liquid that may still carry chlorine or other contaminants. Using filtered water as the base ensures runners are getting the full benefit of their electrolyte supplementation, with nothing unwanted along for the race.
Magnus Jern, co-Founder of Tappwater and water researcher, shares top hydration tips for marathon runners ahead of the big race:
- Start your hydration early. Don't wait until the days before the race, build good hydration habits throughout your training block.
- Filter your water at home. A quality sink filter or filter pitcher removes chlorine, microplastics and heavy metals and gives you clean, great-tasting water on demand.
- DIY your electrolyte drinks. Use electrolyte tablets or drops in filtered tap water rather than buying pre-made bottled versions. You control the dose, save money, and cut plastic waste.
- Take filtered water on the go. Tappwater's BottlePro Adventure filter bottle lets you drink clean, filtered water wherever your training takes you.
- Don't overdo it with electrolytes, and stick to 1-2 per day to restore balance. If in doubt, consult a sports nutritionist.
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