5 Reasons Algae Grows in a Saltwater Pool

Low free chlorine Saltwater pools still need chlorine, and algae means the cell isn’t producing enough. Test and adjust your output or run time.

Not shocking manually Salt systems maintain chlorine but can’t kill an existing algae bloom. You must shock the pool manually after heavy use or rain.

A scaled salt cell Calcium buildup on the cell reduces chlorine production. Clean the cell regularly and keep salt levels in the manufacturer’s range.

Poor circulation Algae thrives in stagnant water. Run your pump long enough each day to keep the water moving through the filter.

High pH or too much stabilizer Chlorine becomes ineffective if pH is above 7.6 or cyanuric acid exceeds 60 ppm. Keep pH at 7.4-7.6 and CYA below 60.