how often do you backwash a pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

As a pool owner, one of the most important tasks that you need to perform is maintaining your pool filter. Not only does it keep your pool water clear and sparkling, but a well-maintained filter can also prolong the life of your pool equipment. One commonly asked question is, "how often do you backwash a pool filter?" In this article, we will answer that question and provide useful insights on pool filter maintenance.

Why is Pool Filter Maintenance Important?

A pool filter serves as the heart of a swimming pool's circulation system. It helps in removing impurities, such as dirt, leaves, and debris from the water, which can make swimmers sick or damage pool equipment. Without regular maintenance, a pool filter can clog, which will reduce the filter's efficiency and could cause breakdowns or malfunctions with other parts of your pool system.

What is Backwashing?

Backwashing is a process to clean a pool filter by reversing the flow of water through the filter. It involves flushing water backward through the filter to remove the buildup of debris in the filter media.

A pool filter can have a sand, cartridge, or diatomaceous earth (DE) media, but the backwashing process is generally similar for each type. It involves switching off the pump, setting the filter valve to "backwash," and turning on the pump, which will force water to flow through the filter in the opposite direction.

How Often Should You Backwash a Pool Filter?

There is no specific time frame or schedule for backwashing a pool filter as every pool and its characteristics are different. Backwashing is necessary when the pressure gauge on your pool filter reads 8-10 psi (pounds per square inch) above the start-up pressure noted when the filter is clean.

Often, pool owners backwash their pools weekly or bi-weekly, depending on the frequency of use and the amount of debris in the pool. For example, if the pool has many trees surrounding it or a considerable amount of rainfall, then the pool filter will need to be backwashed frequently.

Another indication that it's time to backwash is if you notice a decrease in water flow or if the water in the pool appears cloudy, despite having chlorinated water. Cloudy pool water might indicate that the system is not working correctly, and you need to resolve the issue soon.

How to Backwash Your Pool Filter

Backwashing a pool filter is a simple process and can be done by following a few steps:

1. Turn off the pump: Before backwashing, switch off the pool pump to stop the water from flowing into the filter.

2. Turn the valve to backwash: Turn the valve to the backwash setting, which is usually found on your pool's filter control valve. Once you've moved the valve, make sure it's secure, and it can't accidentally shift while you're backwashing.

3. Turn on the pump: After turning on the pump, wait for about two to three minutes, which is usually sufficient time to backwash most filters. If you have a sand filter, then backwash until the waste water turns clear again.

4. Turn the pump off: Stop the pump after several minutes, and return the valve to its original "filter" position.

5. Rinse the filter: Once the filter is back in the "filter" position, run the pump for a few minutes in the "rinse" position. This step helps to remove leftover debris and stabilize the pressure.


Proper pool filter maintenance is fundamental to ensure the longevity and efficiency of your pool system. Backwashing is an essential aspect of this maintenance routine, and knowing how often to backwash is critical. Be sure to keep track of the pressure gauge, and backwash accordingly. Remember that keeping your pool filter clean is critical for maintaining a healthy and safe swimming environment.


Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
Current language:English