How to convert a chlorine pool to saltwater

Introduction

Thinking about making the switch from chlorine to saltwater? You’re not alone. Many pool owners are discovering that saltwater systems are gentler on the skin, easier to maintain, and more cost-effective over time. In this guide, we’ll walk you through how to convert a chlorine pool to saltwater step-by-step so you can enjoy a smoother, more natural swimming experience without giving up clean, clear water.

Why Convert to a Saltwater Pool?

Saltwater pools use a salt chlorine generator to convert salt into chlorine, eliminating the need for constant manual chlorine dosing. Contrary to popular belief, a saltwater pool still uses chlorine—but it’s produced naturally through electrolysis.

Benefits of switching to saltwater include:

• Softer water feel
• Less skin and eye irritation
• Lower long-term chemical costs
• More stable chlorine levels
• Reduced pool odor and harsh chemical smell

While the upfront cost is higher, many pool owners find the long-term convenience and comfort worth it.

Step-by-Step Guide to Converting a Chlorine Pool to Saltwater

Step 1: Check Your Pool’s Compatibility

Before converting, ensure your pool’s materials and system are compatible with salt:

• Concrete, plaster, vinyl, and fiberglass pools are generally fine
• Stainless steel ladders and metal fixtures should be corrosion-resistant
• Heaters and pumps should be salt-compatible or use sacrificial anodes to prevent corrosion

Tip: Check with your pool builder or equipment manufacturer for saltwater suitability.

Step 2: Choose the Right Salt Chlorine Generator

The salt chlorine generator (also called a salt cell or chlorinator) is the core of the system. Choose one rated for at least 1.5 to 2 times your pool’s gallon capacity for efficiency.

Consider:

• Self-cleaning models (reduce maintenance)
• Digital displays or smartphone controls
• Warranty and manufacturer support

Installation type: Inline (plumbed into the return line) or drop-in systems are available depending on setup.

Step 3: Balance Your Water Chemistry

Before adding salt, test and adjust your pool water to these ideal levels:

Note: You may need to add cyanuric acid after conversion, as it helps stabilize chlorine generated by the salt system.

Step 4: Add Pool-Grade Salt

Use 99% pure sodium chloride (NaCl) pool salt—do not use table salt or rock salt. Calculate the required amount based on your pool size.

Typical salt level for operation:
2,500–3,500 ppm, with 3,200 ppm being ideal for most systems.

Formula:
To raise 10,000 gallons of water by 1,000 ppm = add ~83 lbs of salt.

How to add salt:

• Turn off your pump and chlorinator
• Broadcast salt evenly across the shallow end
• Brush to help dissolve
• Run the pump (without the chlorinator) for 24 hours to fully circulate and dissolve the salt

Tip: Avoid adding salt directly into the skimmer or near the main drain.

Step 5: Install the Salt Chlorine Generator

If you’re comfortable with light plumbing and electrical work, you may DIY this step. Otherwise, hire a certified pool technician.

Installation steps:

1. Turn off all power
2. Cut into the return line (after the heater, if applicable)
3. Plumb in the salt cell per the manufacturer’s diagram
4. Mount the control panel on a nearby wall
5. Wire the chlorinator into the pool’s timer or electrical system

Caution: Always follow local codes and use a GFCI breaker.

Step 6: Power On and Calibrate

After salt has fully dissolved and the generator is installed:

• Turn on the system
• Set the chlorine output level (start around 50–60%)
• Monitor readings on the display

It may take a day or two for chlorine levels to stabilize.

Step 7: Test and Adjust as Needed

Use a salt test strip and chlorine test kit to confirm:

• Salt levels are within operational range
• Chlorine production is meeting your needs
• pH remains stable (saltwater systems can raise pH over time)

Adjust output percentage or run time as needed.

Bonus tip: You can still shock your pool with liquid chlorine or non-chlorine shock when needed.

Common Mistakes to Avoid

1. Using the Wrong Type of Salt
Avoid rock salt, water softener pellets, or table salt.

Solution: Use only pool-grade 99% pure sodium chloride.

2. Not Allowing Salt to Fully Dissolve
Running the chlorinator too soon can damage the cell.

Solution: Let the salt circulate for 24 hours before powering on the system.

3. Undersizing the Chlorinator
Too small a unit will struggle to keep up with chlorine demand.

Solution: Size the system for at least 1.5x your pool’s gallon capacity.

4. Forgetting to Maintain the Cell
Scale buildup reduces performance.

Solution: Inspect and clean the salt cell every 3–6 months.

5. Ignoring pH Levels
Saltwater systems tend to raise pH over time.

Solution: Test pH weekly and add acid as needed to keep balance.

Extra Tips & Pool Hacks

• Add a sacrificial zinc anode to your pool to protect metal parts from corrosion.
• Use a pH controller or acid feeder to automate balancing for saltwater pools.
• When winterizing, turn off and store the salt cell per the manufacturer’s instructions.
• Save money long-term by buying salt in bulk and storing it in a dry area.

Related Article: Learn more about [How to Balance Pool Chemicals] to keep your new salt system running smoothly.

Conclusion

Switching to a saltwater pool is a smart move for pool owners looking for a gentler, easier-to-manage swimming experience. By following the steps above—checking compatibility, installing the system correctly, and maintaining water balance—you’ll enjoy soft, sparkling water with fewer chemicals and less hassle.

Final tip: Once set up, your saltwater pool will require less daily effort than a traditional chlorine pool—just keep an eye on the salt level, cell condition, and pH, and you’ll enjoy years of clean and comfortable swimming.