how to backflush a pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

How to Backflush a Pool Filter


Pool filters are an essential component of your swimming pool system. They help to clean the water and ensure that it stays clear and free of debris. However, over time, the filter can become clogged with dirt and other particles, reducing its effectiveness. This is where backwashing or backflushing comes in.

What is Backflushing?

Backflushing refers to the process of cleaning out the filter by forcing water through it in the opposite direction. This dislodges any dirt or debris that has become trapped in the filter and flushes it out of the system. This process should be done on a regular basis to keep your pool water clean and healthy.

When to Backflush?

There are a few signs that your pool filter needs to be backflushed, including:

1. Poor water circulation and flow

2. Reduced suction or pressure at the pool skimmer or return jets

3. Cloudy or murky pool water

4. Excessive debris on the pool floor or in the skimmer

If you notice any of these signs, it is time to backflush your pool filter.

Step by Step Guide to Backflushing:

1. Turn off the pool pump and the heater. This is important to prevent any damage to the system.

2. Locate the backwash valve on your filter. This is usually located on the top or side of the filter tank.

3. Attach a backwash hose to the backwash valve. This hose should be long enough to reach a proper drainage area.

4. Turn on the pump and set it to the backwash mode.

5. Open the backwash valve and allow the water to flow out of the backwash hose. You should see dirty water flowing out of the hose.

6. Continue to run the pump and backwash the filter until the water flowing out of the hose becomes clear.

7. Turn off the pump and close the backwash valve.

8. Rinse the filter by setting the pump to the rinse mode. This will flush out any remaining dirt or debris from the filter.

9. Turn off the pump and close the backwash valve.

10. Turn on the pump and return the filter to its normal setting.

Tips for Backflushing:

1. Backwash your filter once a week during peak swimming season or when you notice a decrease in water flow.

2. During backwashing, monitor the pressure gauge on your filter. When the pressure drops to a certain level, it is time to backwash.

3. Do not over-backwash your filter as this can cause damage to the system.

4. Make sure that the backwash hose is directed away from any sensitive areas, such as gardens or flower beds.

5. It is also a good idea to clean out the skimmer basket and pump strainer basket after backwashing to ensure that the system is clear of debris.


Backflushing your pool filter is a necessary part of maintaining a clean and healthy swimming pool. By following the simple step-by-step process outlined above, you can ensure that your pool water stays clear and free of debris. Remember to backwash your filter regularly and monitor the pressure gauge to ensure that your system is functioning properly. With a little bit of effort, you can enjoy a crystal clear pool all season long.


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