Poolking, your best swimming pool equipment manufacturer and supplier with more than 20 years experience.                                                                              +8613922334815


how to backwash cartridge pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

How to Backwash Cartridge Pool Filter

A cartridge pool filter is an essential part of any swimming pool. It keeps the water clean and free from dirt or debris. It is, therefore, essential to backwash the filter regularly to ensure that it functions effectively. In this article, we'll go over how to backwash a cartridge pool filter.

What is backwashing, and why is it necessary?

Backwashing is a process where water is sent through the pool filter in reverse. It cleans out accumulated dirt and debris that has been trapped in the filter cartridge, allowing for improved filtration. Over time, a cartridge pool filter can become clogged with debris, which can cause the water flow to slow down, reducing its effectiveness at cleaning the water. Backwashing helps maintain the efficiency of the filter, preventing the need for premature filter replacement.

What equipment do you need for backwashing a cartridge pool filter?

Before you start backwashing, you need to ensure that you have the right equipment. The good news is that the process of backwashing a cartridge pool filter is not complicated, and most of the equipment is standard to any swimming pool system. Here are the items you will need:

1. Backwash Hose: This specialized hose is connected to the filter's waste port and is used to carry the dirty water away. Always ensure the hose is long enough to reach a proper drainage point.

2. Multiport valve: This valve is usually located on the filter and is used to control water flow. It’s the same valve used to backwash a sand filter. This valve controls the direction of the water during backwash.

3. Filter cleaner: Use a filter cleaner or degreaser to dissolve oils, grease, and dirt that have accumulated in your cartridge filter. These filters attract these particles and are prone to clogging over time if not cleaned regularly.

What steps should you follow to backwash a cartridge pool filter?

Once you have the necessary equipment, it's time to start the backwash process. Follow these steps to ensure that you do it correctly:

1. Turn off the pool pump: Before you start the backwash process, ensure the pool pump is turned off. This will help avoid any damage to the pool pump and ensure safety throughout the process.

2. Clean out the filter: Remove the cartridge filter from the filter housing and clean it by hosing off any debris or dirt.

3. Check the valve position: Ensure that the multiport valve is set to the backwash position. This will allow the water to flow backward in the filter and push the dirt out.

4. Connect the backwash hose: Connect the backwash hose to the waste port on the multiport valve. Ensure the hose is secure and won't come loose.

5. Backwash the filter: Turn on the pool pump and watch the water flow through the backwash hose. Run the pump for a couple of minutes until the water from the backwash hose runs clear.

6. Rinse the filter: Stop the pump and then set the multiport valve to the Rinse position. This will flush out any remaining debris from the filter.

7. Reinstall the filter: Turn the pump off, and then reinstall the clean cartridge filter into the filter housing.

8. Restart the pool pump: Turn the pool pump back on and enjoy the clean water in your sparkling pool.


Backwashing a cartridge pool filter is an essential process that helps maintain the quality of pool water. Regular backwashing will ensure your pool filter remains in top shape and saves you money in replacement costs over time. Follow these simple steps for backwashing your cartridge pool filter, and you'll have an efficiently functioning pool filter that keeps your water sparkling clean.


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