how to clean a pool filter cartridge with muriatic acid


Author: PoolKing - Pool Sand Filter Manufacturers

Pool filters play an essential role in keeping your water clean and free from debris. However, over time, these filters can accumulate dirt, algae, and other contaminants that can lead to the filter not providing adequate filtration. This is where muriatic acid comes in handy!

What is Muriatic Acid?

Muriatic acid, also known as hydrochloric acid, is a potent chemical used for cleaning surfaces such as concrete, metal, and pool filter cartridges. When correctly used, it can help remove dirt and grime from your pool filter cartridge, increasing its efficiency and prolonging its lifespan.

Why Use Muriatic Acid to Clean Your Pool Filter Cartridge?

Cleaning your pool filter cartridge with muriatic acid is a fast, effective and affordable method. It is more affordable than purchasing a new filter and will save you time and money in the long run. Muriatic acid is also a powerful cleaner that can remove stubborn stains, hard water deposits, and bacteria from your pool filter cartridge. Additionally, cleaning your pool filter cartridge with muriatic acid will improve the overall quality of your pool water.

How to Clean Your Pool Filter Cartridge with Muriatic Acid

Before you start, ensure that you have the following items:

- Muriatic Acid

- Rubber Gloves

- A Plastic Bucket or Container

- Water Hose

- Safety Glasses

Step 1: Remove the filter cartridge from the filter housing

Before you begin cleaning the filter, remove it from the filter housing. This will prevent any debris that is removed from the filter from getting into your pool.

Step 2: Rinse the filter

Using a water hose, rinse the filter thoroughly to remove any loose debris or dirt.

Step 3: Prepare the Muriatic Acid Solution

Mix one-part muriatic acid to ten parts water in a plastic bucket or container. It is essential to mix the solution outside or in a well-ventilated area as muriatic acid produces fumes that can irritate your eyes and throat.

Step 4: Submerge the filter

Place the filter in the solution and allow it to soak for about 30 minutes. Ensure that the filter is entirely covered with the solution.

Step 5: Rinse the filter again

After 30 minutes, take the filter out of the solution and rinse it thoroughly with a water hose.

Step 6: Inspect the Filter

Inspect the filter to ensure that all dirt and debris have been removed. If there is any left, repeat the process until it is clean.

Step 7: Reinstall the Filter

Once the filter is clean, reinstall it into the filter housing.

Precautions when Using Muriatic Acid

Muriatic acid is a potent chemical that should be handled with care. Here are some precautions to take:

- Avoid breathing in the fumes produced by the chemical. It is advisable to wear respirators, especially if you have a pre-existing condition that may be worsened by these fumes.

- Always wear protective gloves when handling muriatic acid.

- Only use plastic or rubber containers when mixing and storing the solution. The acid can corrode metal.

- Keep the acid out of reach of children and pets.

- Do not dispose of the Muriatic acid solution in your pool, sink or toilet as it can corrode your plumbing system. Dispose of the solution as per your community’s guidelines.


Cleaning your pool filter cartridge with muriatic acid is a simple process that will help maintain the filter’s efficiency, prolong its lifespan, and improve the overall quality of your pool water. Follow the steps above and remember to take the necessary precautions. Happy swimming!


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