That strong chlorine smell means your pool needs more chlorine, not less.

That strong chemical smell is not a sign of too much chlorine — it’s a sign of too little usable chlorine, and the fix is usually to shock the pool.

The smell comes from chloramines, which form when chlorine binds with sweat, urine, sunscreen, and other organic stuff swimmers bring in. Free chlorine kills that stuff; the smell lingers when there isn’t enough free chlorine left to finish the job. So the pool smells like a chemical factory precisely because the chlorine is exhausted.

The fix is a shock treatment — add a hefty dose of unstabilized chlorine (usually calcium hypochlorite) in the evening, run the pump overnight, and test the water the next morning. You want free chlorine around 1–3 ppm and combined chlorine (chloramines) under 0.2 ppm. If combined chlorine stays high, you may need to shock again or check your cyanuric acid levels, because too much stabilizer makes chlorine sluggish.

If the smell is only noticeable right at the water’s surface, that’s normal chloramine off-gassing, but it’s still worth shocking to keep the water clean.

Also: get people to shower before swimming. It works better than any chemical.