Why is algae in a saltwater pool usually a chlorine problem?

Algae in a saltwater pool means the salt cell isn’t producing enough chlorine, or something else is off. You still need to shock the pool manually, check for cell scaling, ensure proper circulation, and keep pH at 7.4-7.6 with CYA below 60 ppm. The cell maintains chlorine but won’t kill an existing bloom without manual intervention.