No matter how long you’ve owned your RV, its inevitable that you’ll run into a chore that is just plain CRAPPY; flushing and cleaning your sewer tanks! We’ve compiled a step-by-step guide of how we properly care for our black and gray tanks (sewage system) that will mitigate costly repairs down the road.
RV’s generally have three different holding tanks…
White Tank – Fresh potable water
Gray Tank – Shower and sink dirty water
Black Tank – Toilet water and contents
Here’s what we do:
- Always wait until tanks are two-thirds full before dumping. When hooked up to sewer, we’ve learned to keep both gray and black tank valves closed until dump time as to not allow any waste to dry out or solidify. (Note: there’s controversy of whether to keep the gray tank open vs. closed. ‘We’ keep ours closed based on professional advice).
- On ‘Dump Days’, first and foremost, Don your doctor gloves (rubber/latex gloves). Dump BLACK tank first and flush your GRAY tank second as it will clean black tank ‘crap’ out of your sewer hose.
- Use as much water as possible and back-flush (ours is factory installed). We do this two or three times. If you don’t have a factory installed back-flush system, you can easily install aftermarket systems. The end result you want is the water that flushes from your tanks to be clear.
- Close BOTH Black and Gray tank valves and keep them closed until our next ‘Dump Day’.
- After we’ve thoroughly flushed our systems two or three times, we then dump an ‘environmentally safe’ GEO Method mixture of 1 Cup Calgon Water Softener (cleans scum and prevents hard water deposits on the sensors and breaks down water surface tension) and 1 Cup Borax Powder into a 5-gallon bucket of hot water to disolve and then dump it down your toilet and leave it. This insures we won’t have ‘piling’ in the bottom of the tank.
NOTE: DO NOT USE THIS MIXTURE IN YOUR WATER TANK!
- Just remember, in the black tank WATER IS YOUR FRIEND!
“AFTER YOU GO, LOT’S OF H2O!!”
Sounds simple enough, right?
While we were attending the Heartland Owners Club North American Rally in Goshen, Indiana this past June (2017), we made an appointment with Jim Tome, President of Kleen Tank to give Liberty a colonoscopy and get some professional guidance on how to keep our sewage system and tanks in top notch condition.
BTW, this is ‘Jim’…he was our Kleen Tank guy…and he’s the President (of the company)! Good thing he has a sense of humor! I guess you need that for this kind of job being an RV Proctologist!
Before going on explaining his procedure…
Here’s what Kleen Tank recommends for tank maintenance:
- BEFORE LEAVING FOR YOUR TRIP: Fill gray and black water holding tanks about 1/3 full of fresh water. The sloshing motion of your moving RV combined with the water in the tanks will help break down solids, gently clean the tanks and help with the overall health and maintenance of your RV’s waste holding tanks
- DURING YOUR TRIP OR AS YOU USE YOUR RV: Keep both tanks closed (as we also mentioned above) always. Your tanks’ sensor panel should read 2/3’s to full before dumping. If they don’t and you need to dump, top off both tanks with fresh water for an accelerated exit flow. When you leave the campground, dump the tanks and again, fill each 1/3 full of fresh water for your trip home or next destination. This will help keep your tanks lubricated and the sloshing will minimize maintenance needs.
- AFTER YOUR TRIP: Top off both tanks with fresh water and dump before storing. Be sure to winterize (if applicable) and add a lubricating antifreeze to tanks before storing long-term. This is a critical maintenance need.
We’ve mentioned in our protocol the GEO Method that we use, this is Kleen Tank’s recipe for keeping gray and black tanks clean (he gave us a sample to try):
- The first thing he did was empty both the black and gray tanks.
- He back-flushed the black tank 3x and gray tank 2x thoroughly; filling the tanks and then doing tornado flushes.
- He then, inserted a tube-like hydrojet hose with a thin nozzle on the end up into the plumbing connection and into the tank and started power flushing to clean not only the pipes and tanks, but the sensors also. Even our tank being less than 2 years old, lots of ‘crap’ came out (I know, TMI). He did this for about 15 minutes wiggling it back and forth to get every bend and crevice.
- He flushed the black tank again using a tornado method. YAY! No more chunks of junk! Clear water!
- He then moved onto cleaning our fresh water. If you notice, he changed his gloves. Never use the same gloves that you use on sewer vs. fresh water.
- He removed the panel where the ‘anode’ goes.
- He removed and inspected the anode pictured above which was in good condition because Captain Dan just replaced our anode only a few months ago. BTW, you should change your anode according to use, full-time/part-time status and locations where you’ve parked. Some places have higher calcification and mineral buildups. Inspect them often. Dan changes ours about once a year.
- Once he removed the anode, he carefully drained the hot water tank (it was scalding hot!).
- Jim then attached this flexible nozzle that inserted into where the anode goes. We bought a nozzle at the Rally vendor fair at his table for about $15. You can find them on Amazon; called a ‘RV Water Heater Wand’.
We thought Dan did a good job flushing it out when he changed the anode out but guess what? This is just a fraction of what came out, I guess not so much. Look under the wand to see the calcified chunks. These impede the proper function of your water heater if left in there. So, as you see, this wand will definitely help in future flushings. Get one! Since we already have an on board water filtration system, ours wasn’t ‘that bad’. If your RV does not, consider more frequent cleanings.
After Jim completed the whole process, he told us that 5th wheels are easier and roomier to work with however, there are more twists and turns of the pipes. Travel Trailers, on the other hand, are easiest because the pipes are straighter and shorter.