Question about Black Tanks and full timing

Houston Remodeler wrote:
Round these parts those giant roaches live in the sewers. They can easily walk up the pipe, past an open valve and waltz into the RV. Nasty looking critters.

We keep both our valves closed until ready to dump. Isn't that what the buttons on the control panel are for? To keep an eye on the levels?

That is the safest way. Besides, the tanks are made to be used with the valve closed.

The only time I open the dump valves is when I dump.I only use baking soda between dumps.There has been a few times when I have added powdered bleach to the grey tank between flushes.

samhain7 wrote:
My tank flush also says the tank valve has to be open when flushing....why?

For the obvious reasons listed above AND spraying water into a full tank of water does nothing to clean the tank. You want to spray onto what you're cleaning for it to work properly.

samhain7 wrote:
My tank flush also says the tank valve has to be open when flushing....why?

Water hose connected..water flowing into black tank thru flush sprayer and drain valve closed........

'Howdy neighbor I was looking at your truck...nice when did you get it, how do you like it, that motor really strong, I was thinking about getting one, what kind of mileage yada, yada, yada.......
OH MY WHY IS BROWN FLUID SPEWING OUT OF THE TOP OF YOUR RIG
AH IT STINKS....YUK! Sure am glad that isn't my rig. WHEW gotta go!"

samhain7 wrote:
My tank flush also says the tank valve has to be open when flushing....why?

They don't want you to forget and overflow it. I leave it shut, then walk inside and stare at the sensor monitors until it reads full. I will not let myself get sidetracked :)

Before I let the black out, I fill it through the flush inlet to all the way full, then let it out with the water still running, until it runs clear.

My tank flush also says the tank valve has to be open when flushing....why?

To each their own but FWIW we always keep both grey and black valves shut. We let the black fill up to almost full using plenty of water when not stretching out our time if boon docking, we also let the grey fill as close to full as possible. This ensures us a good gush out black first followed by grey, we also tend every second or third dump, depending on time between do a black rinse and refill if available the grey tank to about two thirds and flush out again.

We use chemicals sometimes but not all the time, and also place a double rinse of the bottle used in the black tank down the grey pipes to prevent any small odour. However, we don't use chemicals all the time if we know we will have plenty of water for flushing, filling the bowl well to form a seal when flushing. Although we do use chemical sometimes, we agree with others that they are not necessary if tanks are thoroughly cleaned at start and enough water available for every use of the vitrine.

A. Open the toilet valve and look down with a flashlight.

B. Insist on a cleaning by All Pro Water Flo. They will,power wash your tanks.

hawkeye-08 wrote:
it was bad enough the previous owners of our trailer left a rock hard pyramid that took lots of water and several trips to get cleaned out.

Ack! We're looking to buy used. Now I'm nervous. Is there a way to check on something like this before buying?

Wouldn't you run an additional risk of odor by leaving the black tank valve open? Press that pedal to flush, and there's an open line to the sewer system. And heaven forbid if the bathroom vent happens to be running.

The sinks and shower have P-traps to seal against sewer gases -- not so on the toilet.

I'm still a relative beginner, but it would seem that would be the case.