The inspect cell light on my Aquarite was blinking which signifies that the 500 hour inspection was due. I inspected the cell and it was perfectly clean. Can I assume that because the cell was spotless that what I thought was scaling on my plaster is just normal mottling? In other words, if I have scale on my plaster does it follow that I should have scale in my salt cell? The Aquarite has the self cleaning feature so perhaps it should be clean regardless of whether I developed scale on my plaster. The cell is about six months old.