how do you backwash your pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

How Do You Backwash Your Pool Filter?

As a pool owner, it's essential to maintain the pool's filter to ensure the water remains clean and clear. Backwashing is a critical component of regular pool maintenance that should be performed every few weeks. This process involves reversing the water flow in the filter to flush out any trapped dirt and debris. Here's everything you need to know about how to backwash your pool filter.

Understanding the Purpose of a Pool Filter

Before we delve into the backwashing process, let's discuss why a pool filter is essential. A pool filter helps to remove dirt, debris, and other contaminants from the water, resulting in clean and healthy pool water. Without a filter, the pool water would become cloudy, dirty, and even hazardous to swim in.

Selecting the Right Type of Filter for Your Pool

There are several types of pool filters available, including sand, cartridge, and diatomaceous earth (DE) filters. Choosing the right filter for your pool depends on the size of the pool, the level of debris, and your budget. Sand filters are the most common, while DE filters are pricier but more efficient at trapping particles.

Knowing When to Backwash Your Pool Filter

It's essential to backwash your pool filter when the pressure gauge shows an increase in pressure or flow. This indicates that the filter is clogged and needs to be cleaned. It's recommended to backwash your filter every few weeks, depending on the frequency of pool usage.

Steps to Backwash Your Pool Filter

1. Turn off the pool pump

Before backwashing your pool filter, turn off the pool pump. This step is crucial in preventing any damage to the filter or pool equipment.

2. Locate the backwash valve

Next, locate the backwash valve on your pool plumbing system. The location of the valve varies depending on the filter type and model.

3. Connect the backwash hose

Connect the backwash hose to the fitting on the backwash valve. Ensure the hose is securely attached and can withstand the water pressure.

4. Turn on the pump

Turn on the pool pump and let it run for several minutes. This process will reverse the water flow through the filter, flushing out any trapped dirt and debris.

5. Check the sight glass

Observe the sight glass on the backwash valve until the water runs clear. This indicates that the filter is clean.

6. Turn off the pump

Once the water runs clear, turn off the pool pump and disconnect the backwash hose.

7. Rinse the filter

To ensure the filter is completely clean, it's recommended to rinse it with clean water. Turn on the pump and rinse the filter for several minutes.

8. Turn off the pump

Finally, turn off the pump and reset the filter's pressure gauge.


Maintaining your pool filter is crucial to keep the pool water clean and clear. Backwashing the filter every few weeks is an essential step in regular pool maintenance. By following these simple steps, you can efficiently backwash your pool filter and ensure the pool water remains healthy and enjoyable to swim in.


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