[Motor31]

I know from everyday use that we can go 8 days on the black tank. I use the flusher on each dump. It is spraying before I open the valve and I leave it spraying the entire time. I open the valve and dump the tank, once it's empty I close the valve for 2 minutes to build up a bit of water then open the valve again. I do that twice, each time it gets about 5 to 10 gallons of water depending on water pressure and or flow rate. Then I close the valve for 20 seconds or so to put water in the tank for the next use before shutting off the flush hose and opening the grey tank. We use two loads of laundry water to flush the hose and grey tank.

Using this method the sensors stay somewhat clean but as soon as the level starts to go up a bit they go on to the 2/3 mark. So far I haven't worked up the ambition to get the after marklet sensors.