That strong “chlorine” smell is the one thing in pool care almost everyone gets backwards. It isn’t too much chlorine — it’s a sign you have too little. Here’s what you’re really smelling, and how to clear it for good.
A clean, properly chlorinated pool barely smells. That sharp smell is chloramines — and spotting it is pool-care 101. If your water’s getting to the smelly stage, it’s fair to ask how closely it’s really being looked after.
That sharp “pool” smell is chloramines — what’s left after chlorine reacts with sweat, oils, sunscreen, and urine. Clean, properly chlorinated water barely smells at all. The strong smell is the byproduct, not the sanitizer.
This is the part that trips everyone up. A strong smell means your free chlorine ran low and let chloramines build up. The fix is more chlorine — a shock — to burn them off, not backing off and waiting.
Red eyes and itchy skin after swimming get blamed on “too much chlorine.” It’s actually those same chloramines, often with an off pH. Balanced, well-chlorinated water doesn’t burn — irritation is a sign something’s off.
Chloramines form when chlorine reacts with everything swimmers and nature bring in. Knowing the sources is how you keep the smell from building back up.
Sweat, body oils, sunscreen, lotions, and deodorant all rinse off into the water. The more people in the pool — and the hotter the day — the more material there is for chlorine to react with and turn into chloramines.
Urine and other nitrogen sources combine with chlorine to form the smelliest, most irritating chloramines of all. It’s the classic “busy pool on a hot weekend” smell — and no, it’s not the chlorine doing it.
Leaves, pollen, grass, and rain runoff add a steady organic load for chlorine to chew through. In Florida that load never really stops, so chloramines build quietly between proper shocks.
Chloramines only clear when free chlorine is high enough to break them apart. Let it drift low — or lock it up with too much stabilizer — and they pile up faster than the chlorine left can destroy them.
Almost every pool that “smells too strong” got there by treating the smell as too much chlorine. Do the opposite of these and the smell clears fast.
There’s no air-freshener trick for a pool — you have to destroy the chloramines. Here’s the exact process that does it, in the order that works.
Total chlorine minus free chlorine equals your chloramines (combined chlorine). Anything over about 0.5 ppm combined is what’s making the smell — and tells us how hard we need to shock.
We raise free chlorine high enough — roughly ten times the combined chlorine reading — to blow past “breakpoint” and actually destroy the chloramines. A timid dose won’t do it. Done at dusk so the sun doesn’t burn it off first.
We keep the pump running so the shock reaches every corner and the broken-down chloramines gas off at the surface. Circulation is half the job — still water holds the smell.
A quick rinse-off before swimming, no peeing in the pool, and skimming out debris all mean less for chlorine to react with — so chloramines don’t just build straight back up after the shock.
We confirm combined chlorine is back near zero, then rebalance free chlorine and pH so the water is comfortable again — no smell, no sting, properly sanitized.
If the smell is back within days of shocking, your free chlorine isn’t holding. These two are the usual reasons why.
The questions homeowners ask most about a smelly pool. See all FAQs →
That sharp smell isn’t chlorine — it’s chloramines, the byproduct left when chlorine reacts with sweat, oils, sunscreen, and urine. A strong smell almost always means your free chlorine ran low and let chloramines build up. The fix is to shock the pool to burn them off, not to add less chlorine.
No — it usually means the opposite. Properly chlorinated water barely smells. The strong “pool smell” is combined chlorine (chloramines), which builds up when free chlorine is too low to break it down. So a strong smell is a sign you need more chlorine, in the form of a shock, not less.
Red, stinging eyes and itchy skin are caused by chloramines and an off pH — not “too much chlorine,” which is the common myth. Clean water balanced to the right pH and free-chlorine level doesn’t burn. Irritation is a signal the water needs attention, not avoidance.
Shock it. Test free and combined chlorine, then raise free chlorine past “breakpoint” — about ten times the combined reading — to destroy the chloramines, ideally at dusk. Keep the filter running to circulate and let them gas off, then retest and rebalance pH and chlorine.
A strong smell means chloramines are high and your sanitizer is overwhelmed, so it’s best to shock and clear it first — especially for anyone with sensitive eyes, skin, or asthma. Once the smell is gone and free chlorine is back in the 1–4 ppm range, the water is comfortable and properly sanitized.
Keep free chlorine steady in range so chloramines never get a chance to build, manage bather load on hot busy days, rinse off before swimming, and keep your stabilizer (CYA) from getting so high it locks up your chlorine. Steady sanitation is what keeps the water smelling like nothing at all.
We keep free chlorine steady and chloramines at zero across St. Petersburg and the Tampa Bay area — clear, comfortable water every week for one flat rate.