Why Your Pool Water Burns Your Eyes (Hint: It's Not Chlorine)

Why Your Pool Water Burns Your Eyes (Hint: It’s Not Chlorine)

Most people jump into a pool, feel that familiar eye-burning sting, and assume one thing: “There’s too much chlorine in here!” But that’s almost never the case. Eye burn comes from imbalanced pH and combined chlorine, not fresh chlorine.

Here’s what homeowners never hear—finally explained in plain language.

The REAL Reason Pool Water Burns Your Eyes

Eye irritation only happens when your water chemistry drifts out of balance. The two biggest reasons are low pH and combined chlorine.

1. Low pH (water is too acidic)

What is pH?
pH measures how acidic or basic the water is on a scale from 0–14. Low pH = acidic, high pH = basic, neutral is around 7. Your eyes have a natural pH of 7.4–7.6. That’s why properly balanced pool water never burns.

What happens when pH is too low?
Water becomes acidic and instantly irritates eyes, skin, and mucous membranes. Symptoms include burning eyes, itchy skin, “sharp” or “stingy” water, faded swimwear, fast chlorine loss, and potential corrosion to metal parts.

How to fix low or high pH:
• If pH is below 7.2, add pH Up (soda ash).
• If pH is above 7.8, add pH Down (dry acid or muriatic acid).
Circulate for 1–2 hours and test again. Balanced pH fixes about 80% of all eye irritation.

2. Combined Chlorine (chloramines)

What is combined chlorine?
When chlorine sanitizes the water, it attaches to contaminants like sweat, oils, sunscreen, saliva, urine, and makeup. Once chlorine binds to these, it becomes combined chlorine, also known as chloramines.

Chloramines irritate eyes, irritate skin, create a strong “chlorine smell,” reduce clarity, and weaken sanitizer power.

This is the part homeowners don’t know: If your pool smells like chlorine, it actually needs MORE chlorine—not less. That smell is chloramines, and they only go away when you add fresh chlorine.

Chlorine vs. Shock — What’s the difference?
Regular chlorine is your everyday sanitizer. Pool shock is a high dose of chlorine used to break down chloramines and kill organics all at once.

Shock is stronger because it oxidizes contaminants, destroys chloramines, resets water quality, and restores sanitizer strength. You cannot remove chloramines with normal chlorine doses — you need shock. That’s why a pool can have “normal chlorine” but still burn eyes.

3. High pH (also causes irritation)

High pH makes chlorine less effective. Weak chlorine leads to more organics, more chloramines, and more eye burn. Balanced water is essential.

4. High Stabilizer (CYA)

What is CYA?
CYA (cyanuric acid) is stabilizer — it protects chlorine from being destroyed by the sun. You want some CYA in your pool, but too much creates chlorine lock.

Symptoms of high CYA:
• chlorine becomes sluggish
• sanitizer can’t keep up
• chloramines form faster
• eye irritation increases
• water smells “dirty”

How does CYA get too high?
• using too many chlorine tablets
• using stabilized granular chlorine
• never diluting or draining water

How to fix high CYA:
Drain and replace a portion of the pool water. No chemical removes CYA from the water.

Why weekly testing matters: CYA creeps up slowly. When it’s too high, chlorine stops working the way it should—and swimmers feel it.

5. Heavy Swimmer Load

Lots of swimmers introduce sunscreen, sweat, lotions, and body oils, which overwhelm chlorine and create chloramines. Then come burning eyes.

6. Not Running the Pump Long Enough

Poor circulation causes uneven chemistry, pH pockets, and chloramine buildup. A proper pump schedule is essential for balanced water.

How to Fix Eye Burning in Your Pool (Step by Step)

1. Test pH FIRST
Aim for 7.4–7.6.

2. Shock the pool if you smell chlorine
A strong smell means chloramines — shock breaks them apart.

3. Run your pump longer
Especially after parties, storms, or heavy use.

4. Clean your filter
Dirty filters recycle contaminants, increasing irritation.

5. Check stabilizer (CYA)
If high, dilute the pool by draining and refilling part of the water.

Sparkling Pools Tips

• Burning eyes come from pH or chloramines — not “too much chlorine.”
• A strong “chlorine smell” means the pool needs shock.
• pH testing solves almost every irritation issue.
• Tablets raise CYA — use them wisely.
• After big pool parties, shock and run the pump overnight.
• Weekly testing prevents major water problems.

Final Thoughts

If your pool water burns your eyes, don’t blame chlorine — look at pH, combined chlorine, and stabilizer levels. Once your water is balanced, irritation disappears, the smell goes away, and your pool feels totally different.

If irritation keeps happening or you’re tired of guessing, Sparkling Pools can test and balance your water quickly and correctly.

Need help? Call us anytime at 305-823-5438.