[Jack in Alaska]

Using plenty (a reasonable amout)of water when flushing the toilet, dumping once per week, usually Sun. morning, watching it go away through the clear adapter and having the built-in in tank water spritzer going while dumping has worked for us. This is when parked for long term.
When traveling I dump every 3 days after putting in excess water the 2nd day and dump as soon as we stop and hook up, not after setting alll night.
My fluid level sensors have never worked after the 1st tank full on this RV or any of the previous eight Rv's I have owned. You just learn to live without them.