Does pool shock get rid of algae?

Author: Camylle Auer  |  Last update: Sunday, April 26, 2026

Shocking your pool with chlorine can be an effective method to kill algae. The process can take up to three days and we recommend checking with a pool professional for the amount of shock you should use for your particular pool.

How long does it take for pool shock to kill algae?

Run your pool pump for about 36-48 hours during the algae treatment process.

Should I shock my pool if it has algae?

The best offense is a good defense: don't kill the algae with shock, prevent it from ever growing in the first place! However, if it is already too late and your pool is turning green, follow the SLAM process instead of using shock.

What is the fastest way to get rid of algae in a pool?

The best way to get rid of algae is by using chlorine or other chemicals that kill bacteria . You can also vacuum it off the bottom of your pool with a pool cleaner, scrub it out using a long-handled brush or use an algae killer that you just add to your filter.

Is it better to use shock or algaecide?

Basically using algaecide weekly will target algae growth and prevent it, but shock is a more general addition of chlorine. If this is a one time issue try shock because it's cheaper and might take care of the job, but if this is happening consistently I recommend using algicide weekly.

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Is it OK to add shock and algaecide at the same time?

Can I add algaecide and shock at the same time? No. Let the shock try to fight the algae first. Add algaecide about 24 hours after shock to finish the job and prevent future algae blooms.

Why is my pool still green after shocking it?

If your pool is green and cloudy, it's likely an algae problem. Algae can persist in a pool even after shocking. A green pool – especially one that turned green overnight or after rain, can also be from a pool pump that isn't properly circulating water or an issue with your filtering system.

What clears a green pool fast?

How to Clear Green Pool Water Fast?
  • Shock the Pool: Use a high dose of chlorine shock treatment. ...
  • Use an Algaecide: Add an algaecide suitable for your pool type. ...
  • Clarifying the water: Add a clarifier the next day to bind the dead algae particles and make them easier to filter out.

What kills algae in a pool, shock or chlorine?

Shocking your pool with chlorine can be an effective method to kill algae. The process can take up to three days and we recommend checking with a pool professional for the amount of shock you should use for your particular pool.

How often should I shock my pool?

Shocking your pool regularly will help to keep the water clean and free of contaminants. You should aim to shock your pool about once a week, with the additional shock after heavy use. Some tell-tale signs that your pool needs to be shocked are cloudy, foamy, green, or odourous water.

How many bags of shock for a green pool?

Use a quadruple dose of shock. One pound of shock treats 10,000 gallons of water. So if you have a 20,000-gallon pool, and your water is dark green, you'll need 6 bags of shock. That's a triple dose.

Why is chlorine not killing algae?

Algae will remain in your pool after shock if you've had insufficient chlorine and an overabundance of metal elements in the pool water. Therefore, to start the cleaning process. Remove all the debris from the pool with a leaf net and then let the smaller dirt fragments settle.

How to remove algae without scrubbing?

Determine how severe the algae or other biological growth is. For heavy soiling, dilute 2 parts water to 1 part GK Greener Kleener. For light to medium soiling dilute 3 parts water to 1 part GK Greener Kleener. Easily apply the formula to the affected area using a garden sprayer or a brush.

Why is shock not killing the algae in my pool?

The shock you used may be expired or isn't strong enough. It is also possible that you didn't use it correctly. The ideal shock dosage is 1 pound per 10,000 gallons of water. But you may need to put more depending on the level of algae infestation.

What is the best algae killer for pools?

What's the best way to get rid of green algae? Suncoast All In One Algaecide is the best way to get rid of algae in your pool. It kills and prevents every type of algae, including black, green and yellow mustard algae, as well as pink bacteria. In addition, it has clarifying properties to help keep your pool clear.

What is the best pool shock for algae?

Calcium Hypochlorite Pool Shock: Power Powder Plus 73

Leslie's Power Powder Plus 73 is the fastest dissolving granular shock on the market. This particular cal-hypo pool shock is 73% calcium hypochlorite, which means it can handle the toughest algae and bacteria problems.

Should I add shock or algaecide first?

While shocking and adding algaecide is effective in getting rid of algae, it should not be done together. This is because when you mix chlorine and algaecide together, it renders both of them useless. Hence, you should first shock the pool and wait for the chlorine levels to fall below 5 PPM.

Can I put too much shock in my pool?

Is it possible to shock your pool too much? Yes—excessive shocking of your pool will keep it at an elevated chlorine level. This will cause irritation of the skin and eyes as well as excessive wear and tear on your pool filter system, including excessive corrosion of all metal parts.

Should I backwash after shocking the pool?

If you're dealing with an algae infestation, brush the pool after shocking to remove lingering debris and run the filter. Rinse or backwash your filter to avoid recontamination. If you've still got traces of algae, shock your pool again.

How to get crystal clear pool water?

To treat cloudy water due to poor filtration:
  1. Check your filter for worn or broken parts. ...
  2. Run the pump for at least 8 hours a day. ...
  3. Backwash the filter until a clear stream of water flows.
  4. Chemically clean your filter media with a filter cleaner.
  5. Empty any debris in the skimmer basket that may clog water flow.

Will a magic eraser help a green pool?

Nannini's test suggests that the Magic Eraser works to an extent, but is not a cure-all. “I'd say it's just collecting the algae, but it's definitely not correcting any water balance,” she said.

How long does it take to get algae out of a pool?

Depending on the severity of your algae problem, it can take 24 hours to five days to clear up your pool completely. It depends on how long it takes to test and balance your water, as well as if you need to repeat any of the algae-cleaning steps.

How much shock to get rid of algae?

So How Much Shock Treatment for Yellow Algae? Recommended Treatment: 3LB of Calcium Hypochlorite for every 10,000 gallons of pool water.

Will baking soda clear a green pool?

As pool experts, we hear this question a lot. The short answer is no; baking soda will not clear a green pool, as it cannot kill algae. Adding baking soda to your pool will, however, raise your alkalinity and pH levels and can be helpful when dealing with small growths of black algae.

Is it safe to swim in a pool with algae?

No matter how mild or severe, it isn't recommended. There are several health & safety concerns that come with swimming in a pool with algae, including: Slippery: If algae has grown on the bottom of the pool or is present around the edges, it can form a slippery surface which can pose an injury risk to pool users.

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