how does backwashing a pool filter work


Author: Poolking - Swimming Pool Equipment Manufacturer

How Does Backwashing a Pool Filter Work?

If you own a swimming pool, you know the importance of keeping your pool clean and well-maintained. One of the critical components of a swimming pool is the pool filter. Proper maintenance of the pool filter ensures that the water in the pool remains clean, clear, and safe for swimming.

One of the essential steps in maintaining a pool filter is backwashing. Backwashing a pool filter is a process by which you flush out the accumulated debris and particles from the filter media. This process involves reversing the flow of water through the filter, causing any debris to be flushed out of the filter, and out of your pool.

If you are a new pool owner, you might be wondering, how does backwashing a pool filter work? This article will break down the process of backwashing and explain how it works, and why it's essential for the proper maintenance of your pool.

Why is Backwashing Necessary?

Pool filters work by trapping debris and particles in the filter media, such as sand, diatomaceous earth, or cartridge filters. Over time, the accumulated debris and particles clog the filter media, preventing the water from circulating through the filter effectively. This leads to reduced water flow, which can result in cloudy water or even algae growth.

Backwashing ensures that the filter is working at its maximum capacity by flushing out the accumulated debris and particles from the filter media. By doing so, the pool filter can efficiently trap additional debris and particles, keeping the water in the pool clean and safe.

How Often Should You Backwash Your Pool Filter?

The frequency of backwashing depends on several factors, such as the size of the pool, the filter media, and how often the pool is used. Normally, it's recommended to backwash your pool filter at least every four to six weeks. If you notice the water flow is reduced, or the water appears cloudy, you should consider backwashing your pool filter more often.

How to Backwash Your Pool Filter

Backwashing your pool filter is a straightforward process that can be completed in a few simple steps.

Step 1: Turn off the pool pump

Before starting the backwashing process, turn off the pool pump to prevent any debris from circulating through the pool.

Step 2: Turn the backwash valve

Located on the filter, the backwash valve should be turned to allow the reverse flow of water through the filter.

Step 3: Turn on the pump

Once the backwash valve is turned on, turn on the pool pump to allow the water to flow in the opposite direction through the filter.

Step 4: Wait

Allow the water to flow through the filter for two to three minutes or until the water runs clear.

Step 5: Turn off the pump

Once the water runs clear, turn off the pump.

Step 6: Turn the filter valve to rinse

Turn the filter valve to rinse to flush out any remaining debris from the filter media.

Step 7: Turn off the pump

After five to ten minutes of rinsing, turn off the pump.

Step 8: Turn the valve back to filter

Finally, turn the valve back to filter, and you're done.


In conclusion, backwashing a pool filter is an essential step in proper pool maintenance. By flushing out the accumulated debris and particles from the filter media, your pool filter can function at its maximum capacity, keeping your pool water clean and safe for swimming. Make sure to backwash your pool filter regularly, depending on the size and usage of your pool. Following the simple steps outlined in this article ensures that your pool filter runs optimally and keeps your pool clean, clear, and safe.


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