Performing a Mild Acid Wash on Your Pool's Salt Cell

Maintaining your pool’s salt chlorinator (salt cell) is essential for optimal performance. Over time, calcium deposits and other mineral build-ups can accumulate on the salt cell plates, reducing their efficiency. A mild acid wash can help clean the salt cell, restoring its ability to generate chlorine for your pool.

When to Do a Mild Acid Wash on Your Salt Cell

1. Low Chlorine Production:

If the salt cell is producing less chlorine than usual, it could be a sign that there is scale build-up. If your pool’s chlorine production seems inadequate despite the salt levels being correct, it may be time for an acid wash.

2. Noticeable Calcium Deposits:

Inspect the salt cell for visible white scaling or mineral deposits. This is typically calcium that has built up over time. If the deposits are visible, cleaning the cell is a good idea.

3. Regular Maintenance Schedule:

Even if there’s no visible build-up, performing a mild acid wash every 3–6 months (depending on your pool's usage, water chemistry, and local water hardness) can help maintain the salt cell’s efficiency.

4. High Salt Level Warning:

If your salt chlorinator displays a “high salt” or “cell error” message but the pool water has a normal salt level, mineral buildup could be affecting the sensor. A mild acid wash might clear up the issue.

Performing a Mild Acid Wash

What You’ll Need

• Muriatic acid (diluted) or pH Down (if available)
• Plastic bucket or container
• Garden hose with a spray nozzle
• Rubber gloves (to protect your skin)
• Safety goggles (to protect your eyes from splashes)
• Bucket or large container to hold the salt cell
• Stiff brush or toothbrush (optional, for extra cleaning)
• Water hose (for rinsing)

Step 1: Turn Off the Pool Equipment

Before starting, turn off the pool’s pump and salt chlorinator system. Ensure the pool’s filter system is also turned off to prevent any damage or mishap while cleaning the salt cell.

Step 2: Remove the Salt Cell

Carefully remove the salt cell from its housing. Most salt cells are attached with screws or clamps. Be sure to follow the manufacturer’s instructions for removal. Make sure you don't damage any of the surrounding components while taking the salt cell out.

Step 3: Inspect the Salt Cell

Take a close look at the salt cell. Check for visible mineral deposits, corrosion, or other signs of damage. If there’s a large amount of scale buildup, it’s a good time for an acid wash.

Step 4: Prepare the Cleaning Solution

Create a diluted acid solution. Mix one part muriatic acid with ten parts water. This will create a mild solution that is strong enough to break down the mineral build-up without damaging the salt cell. Always add acid to water (never water to acid) to avoid dangerous reactions.

Note: If you’re uncomfortable using muriatic acid, you can also use a pH Down or pool scale remover that’s designed for salt cells.

Step 5: Soak the Salt Cell

Place the salt cell into the bucket or container. Pour the acid solution into the container so that the salt cell is completely submerged. Allow it to soak for about 10–15 minutes. You will notice bubbling or fizzing as the acid reacts with the mineral deposits. Don’t leave the cell submerged for longer than 20 minutes to avoid damage.

Step 6: Scrub if Necessary

After soaking, if any stubborn build-up remains, gently scrub the salt cell plates with a soft-bristled brush or a toothbrush. Be careful not to scratch or damage the plates.

Step 7: Rinse Thoroughly

Once the soaking and scrubbing are complete, rinse the salt cell thoroughly with a garden hose to remove any remaining acid and debris. Make sure all the acid is washed off before reattaching the salt cell to the system.

Step 8: Inspect and Reinstall

Inspect the salt cell again to ensure it’s clean and free from any remaining build-up. Once it’s dry, reinstall the salt cell in its housing and secure it as necessary.

Step 9: Test the System

Turn the pool equipment back on and check the salt chlorinator’s operation. Ensure that it’s generating chlorine properly and that no error codes or warnings appear. It may take a few hours for the system to adjust to the cleaning.

Safety Tips

• Wear gloves and goggles when handling acid to protect yourself from potential splashes or contact with the skin.
• Ventilate the area properly when using muriatic acid, as it can release fumes.
• Handle muriatic acid with care; store it in a safe location, away from children and pets.