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How to Backwash a Pool

How to Backwash a Pool

If you have a swimming pool you surely know how important is to maintain it clean. One of the major things you have to do in order to maintain the water clean at all times is to backwash the pool filter. Although many people think this a complicated job, you should know that if you properly follow the instructions provided by the manufacturer, the entire job should last several minutes. Many of the pools have a sand filter, being easy to operate and quite reliable when it comes to filtering the water. The other available types of pool filters are cartridge filters and DE filter, which are also a great choice. The main purpose of the backwashing is to remove the contaminants from the filter by simply reversing the flow of water. This means that just with a little help from your part, the filter will automatically clean itself.

One interesting thing you should know is that you can prolong the life of your pool filter with the help of an automatic pressure side or a robotic pool cleaner. Both of them have been compared by, they have a separate filter back, so they basically filter the water. This means less wear and clogging on the pool filter, which also means less backwashing. These pool cleaners deliver great efficiency, keeping the water sparkling clean with no hassle. At the same time, they are easy to use, help you save money on energy and provide years of satisfying performance.

In what concerns the backwashing procedure, if you don’t know yet how to properly backwash your pool, we have gathered here some information that will help you finish the job successfully.

Determine When It’s Time to Backwash the Filter

First, you have to determine when it’s time to backwash the filter. Usually, this depends on how often you use the swimming pool, but for a sand filter, it’s recommended that you perform the procedure once a month. However, as a tip, you should know that when the pressure gauge shows a pressure rise of 6-10 PSI above normal operation readings, it’s time to take some action. In most cases, a pressure over 30 PSI is considered very high, although there are some filters that can handle a higher pressure.

Prepare the Settings to Start the Backwashing

Before you start the cleaning process, you shouldn’t add any chemicals to the pool, you can add them when you finish the backwashing. Also, you have to make sure you turn off the pool pump in order to prevent any possible damage. Then, you have to move the handle of the pump from the filter setting to the backwash position. So far, so good.

Turn On the Pump and Wash the Filter Thoroughly

The next step is to turn on the pump again and leave the water run until the water is clear. This process shouldn’t take more than several minutes, this mainly depends on how dirty is the filter. As a tip, you can look inside the filter and check the water. At first, it will be quite dirty, but then, when the dirt will be washed away, it will be much cleaner. After that, all you have to do is to turn off the pump again and prepare yourself for the next step.

Select the Rinse Position

After you finish backwashing the filter, it’s time to rinse it. While the pump is off, take the handle and turn it to the rinse setting. Then, turn on the pump and let it rinse the filter for up to 1 minute. This step is essential as it cleans the water in pipes, so the remaining particles won’t return to the pool. After that, don’t forget to turn off the pump.

Repeat the Last Two Steps

For better results, you can repeat the last two steps, by selecting again the backwash setting, and then the rinse setting. You can repeat this as many times as necessary until there’s only clean water that runs through the filter. In this way, you will know for sure the filter has been washed out efficiently.

Return to the Initial Settings

The final step is to return to the initial settings, but first, you have to turn off the pump for the last time. So, turn the handle to the initial position, which is filter position, and turn the pump back on. In this way, the filter will start working again. However, considering the fact that when you backwash the pool filter there will be removed a small quantity of water when you finish the entire process, you should refill the pool with more water.


Backwashing the pool filter is a necessity if you want to keep your swimming pool clear for your family and friends. So, knowing what you have to do it’s very important, especially if you haven’t backwash a swimming pool before. Luckily, the procedure is quite simple, you just have to follow some simple steps.





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