how long do i backwash a pool filter


Backwashing a pool filter is an essential part of pool maintenance that is often overlooked. A dirty pool filter can hinder the performance of your pool, making it more difficult to keep clean and clear. Knowing how long to backwash your pool filter is crucial to the health and longevity of your pool system.

1. Understanding the Basic Functioning of Your Pool Filter

Before delving into how long to backwash your pool filter, let's take a look at the basic functioning of your pool filter. The primary function of a pool filter is to remove impurities from the water. The filter does this by forcing water through a bed of sand or other filtering medium, capturing debris and smaller particles. Over time, the filter becomes clogged with debris, reducing its effectiveness.

2. How to Determine When Your Filter Needs Backwashing

One of the most obvious signs that your pool filter needs backwashing is an increase in the pressure gauge reading on your filter. Typically, when the gauge reads eight to ten pounds higher than its normal range, it's time to backwash the filter. Additionally, if the water in your pool appears cloudy or has a green tint, your pool filter may need cleaning.

3. The Backwashing Process

Now that you know when to backwash your pool filter, let's take a look at the backwashing process. The backwashing process involves reversing the flow of water in the filter to flush out debris and dirt that has accumulated in the filter bed. To begin, switch off the pool pump and switch the multiport valve to the ‘backwash’ option. Turn the pump back on, and the water will now flow in the opposite direction through the filter bed, flushing out the dirt.

4. How Long to Backwash Your Pool Filter

The length of time it takes to complete the backwashing process for your pool filter depends on the type of filter and the size of the pool. Typically, it takes around 2-3 minutes for most pool filters. However, large pool systems or industrial-sized filters may require more extended backwashing times. Make sure to consult your pool filter or system’s manual to verify the correct duration for backwashing.

5. Rinse and Repeat

After backwashing, it's essential to rinse the filter to remove any residual dirt and debris from the filter bed. Switch the multiport valve to the ‘rinse’ position and allow the pump to run for just a few seconds. This will ensure that any remaining debris is flushed from the system before switching the filter back to ‘filter’ mode.

In conclusion, backwashing your pool filter should be a regular part of your pool maintenance routine. It is recommended to backwash your pool filter every four to six weeks, or when the pressure gauge reading is eight to ten pounds higher than its normal range. The backwashing process typically takes between 2-3 minutes, but it's essential to adhere to the manufacturer’s guidelines to ensure safe and effective pool maintenance. Remember, a properly functioning pool filter is key to maintaining healthy and crystal-clear pool water.


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