what kind of a soak time with the vinegar? I do not want to use acid. my buddy does that with his new unit and I dont have his cash reservesThat message will come on every 30 days as a prompt to check the cell plates. You can remove the cell and physically inspect it. If you have some calcium scaling on it then try removing it with a wood or plastic tool. While Hayward says to use diluted acid to clean it that will remove some of the materials from the plates and shorten the cell life. If you must try something to dissolve it then a 10-1 vinegar solution would be better. If the plates are clean then just press and hold the selection button which will reset the warning for the next 30 days (maybe it's measured in hours of operations, I don't remember.)