How much calcium buildup is normal after a month of use. It says here to clean your cell once a year. I cleaned mine about a month ago and i have a little bit of calcium, but not very much. I did notice that the calcium buildup is not on each plate, but only on a few of them. Is this normal? I think my cell is failing and wondering if calcium buildup only on certain plates is an indication that some of the plates are not functioning. Should the calcium buildup be equal on each cell? The plates are all very square edged which the manufacturere said should be an indication that the cell is not used up. I'm thinking it's a malfunctioning cell.