My 2004 American Tradition came from the factory with the SeeLevel system. It works great. After about 8-9 years it began to get inaccurate at times and I learned that scum build-up on the tank walls can affect the readings. I filled the waste tanks with water and added a bottle of Roebic K37 septic treatment and let it sit for a couple days before flushing out. The SeeLevel performed perfectly once again. Had to repeat the tank clean process every couple of years after that, though.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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