I've got an IC-40 cell that I installed in April 2013. After some salt-level issues last year, it worked generally ok through last summer and early fall.
This year, I fired up the pool around the 2nd week of March. Salt level reading was around 2600 ppm, slightly lower than the ~3100 ppm that I had at the end of last season. So I added a couple of 40lb bags. That brought my levels up to around 3000 ppm again.
About 3 weeks ago, I noticed the cell light was red again and the CL levels were near zero. Salt reading was back down to 2600ppm. So I added another bag, and the reading jumped back up to the 3000 range.
This morning, I tested the water and the CL levels were low again. Sure enough, the cell light is red. Salt reading was now down to 1950ppm. I inspected the cell plates and confirmed that there was no visible scaling. There was some green matter (grass blades) partially impeding flow, so I cleaned that out. Remounted the cell after the initial test period, the salt level is reading 2250ppm.
What could possible be causing this? I'm not sure if it's the IC40 or if there is something else going on.