Pentair IntelliChlor: Flashing Green Light (High Salt)
Quick Summary
- A flashing green GOOD light indicates salt levels above 4500 ppm - too high for safe operation.
- High salt increases corrosion risk to pool equipment, metal fixtures, and surrounding surfaces.
- The IntelliChlor continues producing chlorine but at increased risk of equipment damage.
- The only solution is to partially drain and refill the pool with fresh water.
- Drain 6-12 inches at a time, refill, circulate for 24 hours, then retest.
What the Flashing Green Light Means
When the green GOOD light flashes instead of staying solid, it indicates that your pool's salt level has exceeded 4500 ppm. While the IntelliChlor will continue to produce chlorine, this elevated salt concentration poses significant risks to your pool equipment and surrounding areas.
Salt is inherently corrosive. At levels above 4500 ppm, the corrosion risk to metal components, pool heaters, ladders, light fixtures, and even concrete or stone decking increases substantially.
Causes of High Salt
Over-Addition of Salt
The most common cause is simply adding too much salt at once. It's easy to overshoot target levels, especially if you don't wait the full 24 hours for salt to dissolve before testing and adding more.
Evaporation Without Dilution
As water evaporates, salt remains behind and becomes more concentrated. If you only top off the pool occasionally and experience high evaporation rates, salt levels can creep up over time.
Testing Error
Sometimes a faulty test or the IntelliChlor's own sensor can give inaccurate readings. Always verify with an independent test method.
How to Lower Salt Levels
Unlike raising salt, you cannot add a chemical to lower it. The only solution is dilution with fresh water.
Step 1: Drain Partially
Lower the water level by 6-12 inches using your pump's waste setting, a submersible pump, or by backwashing the filter extensively. Check local regulations regarding pool water discharge.
Step 2: Refill with Fresh Water
Add fresh water back to normal operating level. Use a garden hose or whatever fill source you normally use.
Step 3: Circulate and Test
Run the pump for at least 24 hours to fully mix the new water throughout the pool. Then test salt levels independently.
Step 4: Repeat if Necessary
If salt is still above 4000 ppm, repeat the drain and refill process. It's better to do multiple small dilutions than one massive water change, which can destabilize water chemistry.
Target Salt Levels
- Ideal range: 3200-3400 ppm
- Acceptable range: 2800-4000 ppm
- Low warning: Below 2600 ppm (red light, no chlorine)
- High warning: Above 4500 ppm (flashing green)
Preventing High Salt
- Always calculate salt additions carefully before adding
- Wait 24 hours after adding salt before testing and adding more
- Test salt levels weekly
- Add water after significant evaporation to dilute naturally concentrating salt