Pool shocking means extremely and rapidly raising the level of chlorine in your swimming pool for a short time, to a level high enough that the combined chlorine is burned up. It’s a way to keep pool water disinfected, safe and clean.

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Your swimming pool needs to be shocked at least once a week, perhaps more depending on a number of factors. Frequent pool shocking is needed if the pool is used heavily, after a heavy rain, or during hot weather. (Hello, Florida summers.) The best indicator is to monitor the chlorine level. If the combined available chlorine and free-available chlorine levels are below the recommended ranges, then it is time to shock your pool.

Pool Shock Timing

Here’s a tip: shock your pool after the sun has gone down. It saves on chemical costs because the shock is more effective at night, and for longer periods, without the UV light breaking it down.

Pool Shock Preparation

Any pool shock should be pre-dissolved first in water. Fill a 5-gallon bucket with pool water, slowly pour the shock into the water and stir. Take note that the chemical is added to the water and not the other way around.

Shock Your Pool

Run the filtration system and slowly pour the dissolved shock in front of the return line fitting. Fill the bucket back up with pool water and stir it again for one minute to dissolve all the shock granules at the bottom of the bucket.

Pool Water Evaluation

Perform pool water readings before re-entering the pool water. High levels of chlorine can be dangerous to your health. This process is critical and is best left to the experts. If you need assistance or pool service to properly shock your pool on a regular basis, you can contact Pool Doctor of the Palm Beaches at (560) 203 0270. You can also visit our website at or subscribe to our Pool Podcast in iTunes or via RSS.