have an Intellichlor ic20 that has worked perfect for the last six years since my in-ground concrete 15,000 gallon pool was built. Flow light and salt light came on, added 2 bags of salt, was still blinking, tested water now salt hight at 3,800. Know I have do get salt # down (drain a little and dilute). Pool company says cell probably needs replacing, wants almost $900 to replace it. Can buy new one from reputable online pool store for just over $500. What is the downside for doing this to save almost $400. Any advice from anyone greatly appreciated.