can get cleaning wond to flush tank

[wick1027]

my passport 2910bh has been parked in my campground for about 3 months, and the black tank sensor keeps reading 2/3 full, but tank is empthy. bought a wond to go in though toilet to clean tank, but wond would only go down to bottom of toilet, not down to tank. I am I doing something wrong, or is there screen or valve stopping wond going down, please help.

[SteveC7010]

my passport 2910bh has been parked in my campground for about 3 months, and the black tank sensor keeps reading 2/3 full, but tank is empthy. bought a wond to go in though toilet to clean tank, but wond would only go down to bottom of toilet, not down to tank. I am I doing something wrong, or is there screen or valve stopping wond going down, please help.

Just remember that in a TT (as opposed to a fiver), the tank is usually right below the toilet by just the thickness of the floor and another inch or two. If you can only get the wand another 6" to 8" below the level of the floor, you are almost certainly at the bottom of the black tank.

[AlCorr]

my passport 2910bh has been parked in my campground for about 3 months, and the black tank sensor keeps reading 2/3 full, but tank is empthy. bought a wond to go in though toilet to clean tank, but wond would only go down to bottom of toilet, not down to tank. I am I doing something wrong, or is there screen or valve stopping wond going down, please help.

How did you make out, did you get the sensor cleaned?

[rhminva]

My 2013 2910bh is having the exact same issue. I've taken it out 3 times now. After each trip I have washed out the black tank using the attachment on the side of the trailer. After rinsing it out the black tank will read empty. When I pick it up for the next trip two or three weeks later it reads either 1/3 or 2/3rds full.

I'm taking it into the dealer to have them fix a couple of minor things and will also have them look at it. Service appointment is July 24th. I'll post afterwards....

[rhminva]

As I'm a newbie, I'm learning about the general unreliability of the black/grey tank sensors. After reading multiple postings on the subject, it sounds like they just simply aren't that accurate and are prone to misreadings across the board. The dealer flushed mine with a special solution and said it appears to be functioning properly. I'm not going to worry about it any further and use common sense on the level of the black tank. (Just look at it)

[Festus2]

rhminva -
In your readings you have probably determined that keeping your sensors free from the buildup of TP and other solids and subsequent drying out is key to good holding tank maintenance. It is when the sensors are allowed to accumulate dried out solids that they don't function properly.

Make sure that your grey/black tanks always have enough water in them to prevent this from happening and that they are thoroughly flushed out after each trip. Use your black tank back flush after you have dumped. On your way home from the campsite, dump some ice cubes down the toilet along with a couple of buckets of water and some Calgon water softener and let the scrubbing action of the cubes help clean the walls of the tank. The Calgon will help make the inner walls of the tank "slippery" to help stop solids from sticking to the insides.

[rhminva]

Festus2 -

Yep, I learned quite a bit in my research. One thing I really thought useful was the clear section on the dump hose. Surprising how much material comes out on a 2nd or 3rd rinse. I also like the idea of ice cubes.

Thanks!

[Shelbs]

This thread is based on a false assumption that the sensor readings are by nature accurate. This is simply not a true statement. My philosophy is to be happy when I see an empty reading and unconcerned when I see a 2/3 or full reading. Often the two events occur within two or three minutes of each other. FWIW, use your tank flusher and your wand, if you wish, best you can. When you flush and the sound changes, you're full. You should also be able to see the surface up close to the top. You want to empty when it's as full as possible anyway, to allow all the goodies to dissolve.
RV sanitation is like golf: there is a level of technique that needs to be understood. But at the end of the day, it's all about "feel"!

[Festus2]

RV sanitation is like golf: there is a level of technique that needs to be understood. But at the end of the day, it's all about "feel"!

Mmmmmmm. No, it's not just about "feel". Your analogy omitted one important and obvious technique..."Smell!" :eek:

[Shelbs]

Mmmmmmm. No, it's not just about "feel". Your analogy omitted one important and obvious technique..."Smell!" :eek:

Well, yes, there is that! :dizzy:

[AlCorr]

To keep my tanks clean, (black & gray), I use about 1/4 cup of Dawn dish detergent and a cap full of calgon water softener. I put this mix in about once a month or so after I dump the tanks and about a 1/3 of water and it swirled around on my way home and to my next camping trip. I empty the tanks before I set up, I've never had anything stick to it or any clogs. Cheap insurance from the black clog and helps keep is smelling better than it would if it sits a few weeks or a month without use. If you have never cleaned your gray tanks, you would be surprised to see what comes out.
Also, we only use Scott TP, (not the extra soft kind). A Friend once showed us how he put some Scott's TP in a jar of water and gave it a quick shake and it broke down so fast I never used the high priced RV TP and have never had a problem.