I thought my cell was bad because my Aqua Plus display was showing low salt. It was only reading 2000ppm and cell was off. So I took a water sample to local pool store and it was 3500ppm. So they told me I needed a new cell. I ordered a new Hayward T-15 cell from Pool Supply. When I got delivered it is doing the same thing. Only reading 2000ppm. I am lost any help would be appreciated. Thanks