How to Fix a Cloudy Pool
A cloudy pool almost always comes down to one of three things: not enough chlorine, water that’s out of balance (usually high pH or high calcium), or a filter that isn’t keeping up. Test the water, correct the chlorine and pH, clean the filter, then run the pump around the clock. Most cloudy pools clear in 24 to 48 hours. In Bakersfield, dust storms and hard water make cloudy water more common. If you’re not sure where to start, bring a sample to Top Dog Pool Supply for a free test.
Why is my pool cloudy?
- Low chlorine. When chlorine runs out, dirt, sweat, and early algae build up faster than the filter can remove them. In a Bakersfield summer, sun and heat can use up a day's chlorine by mid-afternoon.
- High pH or alkalinity. Above about 7.8, chlorine gets weak and calcium starts coming out of the water as a fine white haze.
- High calcium. Our tap water is hard, and every inch that evaporates leaves its minerals behind. Over a few summers, calcium climbs.
- A dirty or undersized filter, or not enough run time. A clogged cartridge, channeled sand, or a pump on a short timer can't turn the water over often enough.
- Dust, pollen, and wind storms. Valley wind can drop a layer of fine dust in an afternoon, and that dust is often too fine for the filter to catch on its own.
- Early algae. A dull, slightly green-gray haze is often algae starting up before the water turns green.
- Right after shocking. Granular calcium hypochlorite shock can cloud water for a few hours. That usually clears on its own.
How do I fix a cloudy pool, step by step?
- Step 1: Test the water. Check free chlorine, pH, alkalinity, calcium, and stabilizer. Home strips are fine for a quick check, and our free in-store test is more complete.
- Step 2: Clean the filter. Hose off cartridges, or backwash a sand or DE filter according to its manual. Write down the pressure gauge reading after cleaning so you know what "clean" looks like.
- Step 3: Balance pH and alkalinity first. If pH is above 7.6, lower it with muriatic acid, following the label and adding it slowly in front of a return jet. Chlorine works much better once pH is in range.
- Step 4: Shock the pool. Raise free chlorine well above normal. Liquid chlorine added in the evening works best in our climate because the sun isn't there to burn it off. We'll calculate the right amount for your gallons.
- Step 5: Run the pump 24 hours a day and brush. Brush the walls and floor so settled dirt gets back into the water where the filter can catch it. Keep the pump running until the water is clear.
- Step 6: Still hazy after 24 to 48 hours with good numbers? Add a clarifier. A clarifier clumps fine particles together so the filter can catch them. For very cloudy water, a flocculant drops everything to the floor overnight so you can vacuum it out to waste. Most cartridge-only systems can't vacuum to waste, so ask us before using a floc.
- Step 7: Vacuum, clean the filter again, and re-test. Clearing a cloudy pool loads up the filter. Clean it once more when the water clears.
Why does my Bakersfield pool keep getting cloudy?
Pools here work harder than most. Summer days over 100°F burn off chlorine fast, the swim season runs from spring into fall, and evaporation keeps concentrating calcium and minerals from our hard tap water. Add valley dust and wind storms, and a pool that was fine on Monday can be hazy by Thursday. Two habits help most: test weekly during swim season, and run the pump long enough to filter all of the water at least once a day.
When is a cloudy pool beyond DIY?
- The water stays cloudy for 3 to 4 days even though your chemistry tests right and the filter has been running.
- Filter pressure is high right after cleaning, or the gauge barely moves at all.
- Sand or DE powder is blowing back into the pool.
- The pump is running but water barely moves out of the returns.
- Calcium or stabilizer is so high that a partial drain is the only fix. We'll help you decide how much to drain safely.
How long does it take a cloudy pool to clear?
Most cloudy pools clear in 24 to 48 hours once chlorine and pH are corrected and the filter runs nonstop. If the water is still cloudy after 3 to 4 days with good test results, the filter or pump is usually the problem.
Is it safe to swim in a cloudy pool?
No. If you can't clearly see the main drain at the deep end, a swimmer in trouble can't be seen either. Cloudy water also usually means chlorine is too low to kill germs. Wait until the water is clear and chlorine is back in range.
Should I use a clarifier or a flocculant?
Use a clarifier for a light to moderate haze. It helps your filter catch fine particles over a day or two. Use a flocculant only for very cloudy water, and only if you can vacuum to waste, because it drops everything to the floor to be vacuumed out.
Why is my pool cloudy after I shocked it?
Granular calcium hypochlorite shock can cloud water for a few hours, and it adds calcium each time. If the haze lasts past a day, check pH and calcium. In hard-water areas like Bakersfield, liquid chlorine is usually the better choice for shocking.
Can too much chlorine make a pool cloudy?
Chlorine by itself doesn't cause cloudiness. The cloudiness usually comes from what came along with it: calcium from granular shock, or a pH jump. Test pH and calcium first.
Don't cry, we can help
Bring a water sample to Top Dog Pool Supply. Local pool owners get a free water test on our Taylor Xpress Flex system, and we'll tell you what to add, and how much, for your pool's size.
Visit us at 7440 District Blvd Suite B, Bakersfield, CA 93313, or call (661) 664-9000. We're open Monday to Friday 9 to 5, Saturday 9 to 4, and Sundays 10 to 4 from April through September.
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