sb2323 said: We pulled it out and dutifully checked it, and saw nothing wrong. Shortly afterwards the salt level suddenly dropped to 200. I then added 7 bags of salt (thinking the algae was still to blame) and within a day it dropped down to 0 and stayed at 0 for a week. Our control panel this entire time indicated "low salt", not "high salt". The cell is approximately 6 years old, which I think is a fairly normal life span?
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The algae won't affect your salt readings. I would bet anything that your cell is bad. 6 years is a long time for a cell to last....of course it all depends on how many hours it has on it. Have you taken a salt reading with the salt test strips that are available? They are not the most precise measurements but it will show you a ball park number.