How to Back Flush a Pool

How to Back Flush a Pool: Easy & Effective Guide!

How to Back Flush a Pool

In order to keep your pool clean and well-maintained, regular backwashing is essential. Backwashing is the process of cleaning out the filter by reversing the flow of water through it. This helps remove built-up debris and contaminants, ensuring that your pool water stays clear and safe for swimming. In this guide, we will walk you through the steps on how to back flush a pool effectively.

Step 1: Turn Off the Pool Pump

Before starting the backwashing process, make sure to turn off the pool pump to prevent any water flow through the system. This is crucial for the backwashing to work effectively.

Step 2: Locate the Multiport Valve

Next, locate the multiport valve on your pool filter system. This valve controls the flow of water through the filter and allows you to switch between different settings, including backwash.

How to Back Flush a Pool: Easy & Effective Guide!


Step 3: Backwash Position

Turn the multiport valve to the “backwash” position. This will redirect the water flow through the filter in the opposite direction, flushing out the debris and contaminants trapped in the filter.

Step 4: Attach a Backwash Hose

Attach a backwash hose to the waste port on the multiport valve. Make sure the other end of the hose is in a suitable drainage area where the backwash water can be discharged safely.

Step 5: Turn On the Pump

With the backwash hose properly connected, turn on the pool pump. The dirty water will be pumped out through the backwash hose, carrying away the trapped debris from the filter.

How to Back Flush a Pool: Easy & Effective Guide!


Step 6: Monitor the Backwash Process

Keep an eye on the water being discharged through the backwash hose. As the water runs clear, you will know that the backwashing process is complete. This usually takes a few minutes.

Step 7: Rinse and Repeat (If Needed)

After backwashing, it is recommended to switch the multiport valve to the “rinse” position to clear out any remaining debris from the filter. You may need to repeat the backwashing process a few times until the water runs clear.

Step 8: Return to Filter Position

Once the backwashing and rinsing are complete, turn the multiport valve back to the “filter” position. This will resume the normal filtration process, allowing clean water to flow back into the pool.

Step 9: Check the Filter Pressure

After backwashing, check the pressure gauge on the filter to ensure that the pressure has returned to a normal range. If the pressure is still high, it may indicate that the filter needs to be cleaned or backwashed again.

Step 10: Regular Maintenance

It is important to backwash your pool regularly to maintain optimal filtration and water quality. Depending on usage and pool size, backwashing may be required every 1-2 weeks or as needed.


Backwashing your pool is a crucial step in pool maintenance to ensure clean and safe swimming water. By following the step-by-step guide outlined above, you can effectively backwash your pool filter system and keep your pool water crystal clear. Remember to always refer to your pool filter system’s manual for specific instructions and guidelines.

Now that you know how to back flush a pool, you can enjoy a sparkling clean pool all season long!

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