A simple kitchen routine can eliminate up to 90 percent of microscopic plastic contaminants from tap water, according to research published by scientists in the journal Environmental Science & Technology Letters and highlighted by the American Chemical Society (ACS). Boiling drinking water for roughly five minutes followed by standard filtration effectively traps and removes nano- and micro-plastics (NMPs), offering an accessible alternative to expensive filtration systems.
The mechanism relies on minerals naturally present in hard water. As water boils, soluble calcium carbonate converts into insoluble calcium scale (limescale). During this precipitation process, the chalky mineral crusts encapsulate suspended plastic particles, pulling them out of solution and binding them within solid mineral flakes.
To apply this method, bring tap water to a rolling boil for about five minutes, allow it to cool down so the mineral residues settle, and then pour the liquid through a standard paper coffee filter or fine tea strainer to separate the trapped particles. In mineral-rich hard water, this process eliminates up to 90 percent of plastic fragments, while in softer water it captures roughly 25 to 30 percent.
In regions where bottled water and municipal supplies are stored in plastic containers or exposed to high ambient heat, plastic degradation significantly increases the concentration of shed micro-particles. Boiling provides an accessible, cost-effective safeguard to reduce cumulative plastic ingestion and support long-term metabolic health.