Flushing the toilet is routine, but each flush uses 3–9 liters of clean drinking water—just to remove a few centiliters of urine. In a typical household, this adds up to 100 liters a day or 36,000 liters a year. Meanwhile, many people around the world lack daily access to potable water.

A simple, eco-friendly practice—“If it’s yellow, let it mellow”—can help. Urine is sterile and poses no health risk if the toilet is kept clean. Flush every 2–3 days, and use essential oils like lemon or lavender to manage odors naturally.

No special equipment is needed, though dual-flush or low-flush toilets can further reduce waste. Be mindful of others’ preferences in shared spaces; not everyone shares the same habits.

This small change saves water, reduces environmental impact, and costs nothing. It’s a simple step toward a more sustainable future.