RV waste tank management can be intimidating. You hear horror stories. People talk. Hollywood hasn’t helped.
Waste tank management is part and parcel of the RV experience so let’s talk through it. I’ll try to be as straightforward as I can without being too gross. Or dropping too many potty jokes.
How Do You Know If Your Tanks are Full?
It should be obvious right? RVs come with gauges for the black and gray tanks.
Don’t trust the gauges. They suck.
I’m not sure what marvel of engineering it would take to create gauges that actually work, but the stock gauges - even on new RVs - aren’t reliable enough to bother with.
- We know when a gray tank is full when a sink backs up.
- We know our black tank is getting full when the toilet “burps back” a bit when flushing.
- We know when the blank tank is full when we can see the “water” level in the neck of the toilet.
Should You Dump?
If you aren’t full and your next destination has full hookups, skip the dumpstation stop and just hit the road.
Some people worry about going down the road with extra water weight (either in their holding tanks or in the fresh water tank). We don’t. I can’t tell the difference in fuel consumption or in how the trailer tows.
Approaching the Dumpstation
Dumpstations come in all sizes, layouts and orientations. If possible I like to check them out on foot before pulling the trailer in.
Usually you can approach them from either direction - but not always. Sometimes you have to go past, through another campground loop, and return going the opposite direction.
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The biggest thing to watch for is if the center of the dumpstation has a raised concrete pad (like the one in the photo). Drive deep enough into the dumpstation so you don’t end up dragging the trailer over that raised concrete.
Learn where your trailer’s sewer drain is so you can get lined up using your rearview mirror.
Our trailer’s drain is right in front of the trailer tires so I know to stop when my tires are just about to pass up the dumpstation hole.
It seems stupid, but you will encounter dumpstations that are sloped away from the hole.
We keep some wood blocks handy in the bed of the truck and I’ll have the boy jump out to put those under the trailer wheels opposite the dumpstation hole. This levels the trailer out (or even tips it towards the hole) for better drainage.
Gloves or No Gloves?
This is point of contention in the Boyink household. When we first started RVing I carried a box of the disposable gloves they sell in the RV supplies everywhere.
They were more hassle than it was worth. They tore. They folded over. They were hard to get off if it was hot out.
I go gloveless and just clean up when done.
Our sewer hose is stored in our rear bumper. We use one of the Rhinoflex Sewer Hoses and highly recommend it - it’s held up for a couple years where past hoses only lasted a few months.
The only downside is you will need the right-angled end attached to put in the dumpstation hole.
Once connected I look at the sewer hose. If it’s not running downhill towards the dumpstation hole I’ll get out my sewer hose support and put the sewer hose on it so that it does run downhill.
Order of Pulls
Think “dirty to clean”:
- Pull black first
- then the kitchen gray tank
- then the bathroom gray tank
Exception: I try to remember to do quick test pull of the bathroom gray tank.
This is to make sure everything is connected correctly. If your sewer hose comes loose you have a clean gray mess rather than a black stinky mess. Pull the clean gray, let it run long enough to ensure your connections are solid, then close it again and start over with black.
Close each previous pull a moment after opening a new one (rather than leaving all of them open until the end).
The main goal is to chase the black water through your sewer hose with as much gray as possible.
Newer RVs have a “backflushing” system - where you can connect a fresh water hose to a different inlet which connects to sprayers inside the black tank.
I’ll do this at the dumpstation if the tank needs it (I try to backflush every 5-6 dumps) and if the dumpstation has a fresh water hose with a threaded end.
Some of the spring-loaded “towers” at dumpstations don’t have a threaded connection. If they don’t I skip backflushing.
Backflush in between emptying the black and gray tanks. Make sure your black tank pull is open (or you are paying very close attention) or you will reinact one of those movie scenes.