how to acid wash a pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

How to Acid Wash a Pool Filter: A Step-by-Step Guide

If you’re a pool owner, you know the importance of maintaining clean and clear water. However, even with a proper cleaning schedule, over time, your pool filter can become clogged with dirt, bacteria, and other contaminants. This can cause your filter to work less efficiently, leading to poor water quality and potentially costly repairs.

One way to combat this issue is by performing an acid wash on your pool filter. This deep-cleaning technique involves using a mild acid solution to dissolve and remove built-up debris from your filter. In this article, we’ll go over the steps you need to take to acid wash your pool filter effectively.

Safety First

Before we begin, it’s essential to note that acid washing can be dangerous, so it’s important to approach this task with the utmost care. Be sure to wear protective gear, including gloves, goggles, and a face mask, to avoid contact with the acid. Additionally, make sure to work in a well-ventilated area and keep children and pets away from the pool during this process.

Step 1: Turn Off the Pool Equipment

Start by turning off your pool equipment, including the pump, filter, and any other devices that connect to the pool. This will ensure that no water is flowing through the system and will prevent damage during the cleaning process.

Step 2: Remove the Pool Filter

Next, remove the pool filter from its housing. Depending on the type of filter you have, this may involve unclamping or unscrewing the filter housing or disassembling the filter itself. Refer to your pool manual if you need assistance with this step.

Step 3: Prepare the Acid Solution

Once the filter is removed, it’s time to prepare the acid solution. You’ll need to dilute a mild acid, such as muriatic acid, with water, following the manufacturer’s instructions. Typically, one gallon of acid will be sufficient for a standard-sized pool filter.

Step 4: Soak the Filter

Place the pool filter in a large container, such as a plastic storage bin or a garbage can, and pour the acid solution over the filter until it is fully submerged. Allow the filter to soak for approximately 10 to 15 minutes, or as instructed by the manufacturer.

Step 5: Rinse the Filter

After the filter has soaked, carefully rinse it with a hose, removing any remaining acid and debris from the filter. Be sure to rinse the filter thoroughly to ensure the acid solution is completely removed.

Step 6: Reassemble and Install the Filter

Once the filter is fully rinsed, it’s time to reassemble and reinstall it into the filter housing. Follow the manufacturer’s instructions for your specific filter type to ensure proper installation.

Step 7: Turn On the Pool Equipment

Finally, turn on your pool equipment and let the system run for a few minutes to ensure that the filter is functioning correctly. It’s also a good idea to check your pool water chemistry to ensure that it’s balanced and ready for swimming.


Acid washing your pool filter can be a beneficial tool to keep your pool water clean and clear. By following these steps, you can perform an acid wash safely and effectively, ensuring that your pool stays in top condition. Remember to perform this process as needed, typically once per year, or more frequently if your filter is experiencing significant buildup.


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