Algae in a saltwater pool is usually a chlorine problem.

Yes, saltwater pools still need chlorine — the salt cell just makes it for you. If algae is growing, your cell isn’t producing enough, or something else is off.

Most algae outbreaks come down to three things: low free chlorine, poor circulation, or not shocking enough. Salt systems are great at maintaining steady chlorine levels, but they’re not great at the initial kill of an algae bloom. You still need to shock the pool manually once in a while — especially after heavy use or rain.

Also check your salt cell for scaling. A crusty cell makes less chlorine. Clean it if needed, and keep your salt level within the manufacturer’s range. And make sure your pump runs long enough each day — algae loves stagnant water.

If you do all that and still see algae, test your ph and cyanuric acid (stabilizer). High ph or too much stabilizer will render your chlorine useless. Keep ph around 7.4-7.6 and CYA below 60 ppm.

The cell is your generator, not a magic bullet. Maintain it and maintain the water, and algae won’t have a chance.