cleaning sensors in black water tank

About 30 years ago I built a wand that works better than the one from Walmart. About 3' of 1/2" dia copper pipe. Ball valve and hose fitting on one end. Cap on the other end. I drilled two 3/16" dia holes in the side of the capped end. Lots of pressure. You do have to twist it but cleans the tank very well.

Our MH is a 2006 model we bought in 2009. I use one of the sprinkler head wands 3 or 4 times per year and sensors still work fine. They will get where they read 2/3 full and a good cleaning takes care of it. I do have sewer cleanout at home I can hook up to so I can clean longer than if in line at a dump station.

Sensors are prone to clogs. I've put some 20 Mule Team Borax in about a 1/3 of a tank and go for a drive, it helps wash the probes. Don't really trust the sensors but it is nice when they work.

I gave up on those sensor. Did all that ice stuff, back flow washer flush. Strange as it may seem, our BT will go about two weeks from empty (like clockwork) before needing to be emptied with DW and I on board. I start to look and hear when that times coming. After dumping I mark the date on a calendar.

I gave up on those sensor. Strange as it may seem, our BT will go about two weeks from empty (like clockwork) before needing to be emptied with DW and I on board. I start to look and hear when that times coming. After dumping I mark the date on a calendar.

Some European rigs have a round hatch at the top. This would be nice for cleaning out a black water tank... worst case, get a good pair of elbow-length gloves, a scraper and a wet/dry vac, which should take care of almost anything.

downtheroad wrote:
I have used dynamite with good success.

But only once.... :B

Do you have one of those wands that you put down the toilet drain pipe? I use one about every second or third time I dump and my sensors stay clean. I have a "swivel stick" that has a brass nozzle that spins around and sprays everywhere. They have one with a flex hose on it for toilets that aren't mounted right on top of the black tank. They also sell a cheaper one that just has one fixed spray jet that you presumable twist all around inside the hole to clean all the sides and wash everything down. Finally, the tornado rinser seems like a good product. I bought one but haven't installed it yet. It's the same concept as the swivel stick but permanently mounted in the tank. The advantage is you don't have to drag a hose through the camper to use it. It has a piece of hose that mounts to a bracket and you just hook the water up to it right there on the outside of the camper. The down side is you can't twist it all around since it's mounted in the tank.

The other solution is to put several bags of ice down the toilet and drive it on a twisty bumpy road. The ice should slosh around and scrub the tank. Then use a rinser either every time you dump or maybe every other time to keep it clean.

Swivel Stick like mine but with a flexible extension

Tornado Rinser that you have to mount in the tank.

Cool video testing tank mounted rinsers by The Fit RV

Some folks throw in a bag of ice and drive around, others, have black tank sprayers (either built in or use a wand through the toilet.) Still others just accept that they are inaccurate and forget about it.

I have used dynamite with good success.