Salt cell

The cell is where salt turns into chlorine. Electric current runs across metal plates, and the plates slowly wear. Many cells last a few years, depending on use and care. Check your maker's guidance.

Scale on the plates cuts output. Many cells need a periodic inspection and, when scaled, a gentle acid wash per the manual. Low salt, cold water, or poor flow can trigger error lights. Weak chlorine with good salt points to a worn cell. A pro can test and replace it.