[DebNJim B]

After my level gauges gave out I would just wait till the sink and shower backed up to empty the grey tanks. Eventually I started getting leaks I'm guessing where the pipe enters the tank on top, so now I leave the grey tanks open until about 3 days before I'm going to empty the black tank. With just the two of us the black tank will go 7-9 days before the burp arrives so I usually just empty that once a week unless it burps sooner. This routine has worked quite well for us for several years now.