RV Cassette Toilet Pros and Cons

Northstar Cassette ToiletThere’s no doubt about it, there isn’t a truck camper feature more polarizing than the Thetford cassette toilet. You either love it or you hate it. We’ve owned seven RVs over the years and our new Northstar Laredo SC is the first with a cassette toilet. I’d be lying if I said I didn’t have some apprehension about buying a truck camper with this feature. Fortunately, it’s been a non-issue for us. In fact, we really enjoy the freedom that the cassette toilet offers. The purpose of this article is to discuss the pros and cons of the cassette toilet and to share a few tips on how to use and properly care for it.

Before delving into the pros and cons of the cassette toilet, it will be helpful to learn more about its capabilities and features. In the bathroom, the cassette toilet looks and works like any other RV toilet, the only difference being that the cassette toilet is mounted atop a bench seat. It features its own, fixed four gallon fresh water holding tank which is used for flushing. This tank has a retractable fill spout, which is accessed outside through a small hatch, that allows you to fill it with any kind of “clean” water including lake water, regular fresh water, or even the gray water from your camper. The removable cassette, which is also accessed outside through the aforementioned hatch, is basically a 5 gallon black water holding tank with wheels. The cassette has a pull handle on one end and two wheels on the other that allows you to pull the cassette behind you like a rolling suitcase. It also has a convenient pressure release button to facilitate faster dumping.

So what are the pros of owning a cassette toilet? First and foremost, the cassette toilet gives you much more freedom on where you can dump. Rather than limiting you to just RV dump stations, which are sometimes difficult to find, the cassette can be dumped practically anywhere, like at a campground pit toilet and at an interstate rest area bathroom. This freedom on where you can dump also means that you no longer have to deal with the fees, the waiting lines, and the mess associated with using an RV dump (obviously, that you can still use an RV dump to dump your cassette, but it’s no longer mandatory). Moreover, the cassette dumps quickly, is easy to clean, and doesn’t leave a nasty stench in your camper like the traditional black tank is prone to do.

Cassette Toilet in a Northstar Laredo SC truck camper
Bathroom view of a cassette toilet.
Northstar Cassette Toilet
Cassette partially removed.
Northstar Cassette Toilet
The cassette toilet’s fresh water fill spout.
Northstar Cassette Toilet
Cassette after removal from the cassette bay.

Having a cassette toilet offers several additional benefits as well. Since trips to dump stations are no longer needed, you can ditch the annoying “stinky slinky” and use that valuable storage space for something else like a fishing pole. Having an easily transportable cassette also means that you no longer have to break camp with your camper to dump like you would with a conventional RV. Additionally, for those who live in winter climates, having a cassette toilet also means that you can still use the toilet after winterizing your rig, simply fill the four gallon reservoir with RV anti-freeze or windshield wiper fluid and use that for flushing water instead. Finally, having a cassette toilet means that you no longer have to deal with inaccurate black holding tank sensors that always get caked with “stuff,” the cassette has its own, very accurate sensor and red light indicator that illuminates when the tank is almost full. If there’s still any doubt about how full the cassette tank is, simply open the flush lever and take a peek inside. You’ll know when you do that.

The list of cassette toilet cons is short, but for some they’re fairly significant. Obviously, the big negative is the small size of the cassette’s holding tank. Five gallons isn’t very large and is only one-third to one-fifth the size of the standard truck camper black water holding tank. This means you’ll need to be judicious on how often you use the toilet or else you’ll be dumping every four or five days. Cutting usage means using public facilities more, and for guys, going more outside in the woods. Another negative is that removing the cassette from the holding bay requires a small amount of lifting. This isn’t an issue for most, but for some who have back and shoulder issues, lifting a full, 47-pound-cassette could be a problem. Finally, the toilet inside does sit a bit too high, meaning some may be unable to touch the bathroom floor with their toes. Again, not an issue for most, but this could be a major turnoff for some.

Now that we’ve taken a look at the pros and cons of the cassette toilet, here are a few tips on using it. First and foremost, make sure the cassette is empty when the camper is not in use. This means dumping the cassette as soon as you return home from your trips. Never leave the cassette full inside your camper for any length of time because it can dry out, making cleaning difficult and unpleasant. And speaking of cleaning, keep the cassette holding bay clean. We’ve found through regular use, especially on rough roads, that it’s normal to have some minor spillage. It’s best to keep on top of these spills and any dirt that may accumulate inside. I like to use Lysol disinfecting wipes to clean not only the holding bay, but also the cassette itself. They’re bleach free, cheap, and work great.

Should you use a cassette tank additive? Some do and some don’t. Some facilities prohibit the dumping of waste fluids laced with additives in their toilets, so many cassette toilet owners choose not to use an additive and deal with the unpleasant odors when they dump. We haven’t come across that situation, yet, so we still use an additive in our cassette. We use Thetford Aqua Kem. We prefer the small, 32 ounce size bottle because it’s easy to store, and frankly, you don’t need much additive for a 5 gallon cassette. Oh, this reminds me of one other thing, don’t waste your money on the small black water holding tank packets. They’re overkill for the small 5 gallon cassette tank and are made for much larger black water holding tanks. A liquid, like the aforementioned Aqua Kem, is much more economical.

Here’s another tip. If you find through regular use that you fill your cassette too often, you may want to invest in another cassette. I have a few friends who did this and it works well for them. At $200 a pop, they’re expensive, but it’s an option that is available, especially for those extra long boondocking stays. Since Thetford doesn’t deal directly with consumers, you’ll need to contact your truck camper manufacturer to purchase another cassette.

Before closing, I thought I’d address a question that you may have thought of while reading this article. You may be wondering what we do with our gray water now that we no longer visit RV dump stations. We do one of two things. If we’re boondocking where dumping gray water is permitted, which for us is most of the time, we simply dump our tank at the base of a thirsty bush or tree. On the other hand, if we’re at a location where dumping gray water isn’t allowed, then we drive the camper to a local toilet, and use the cassette as an auxiliary gray tank. We remove the cassette from the cassette holding bay, place it on the ground, then we run a short hose from the gray water drain cap to the cassette and empty out the gray water holding tank. Our gray tank is only 13 gallons, so we’ll never need to make more than three trips to the toilet to empty the gray tank. Doing this not only empties the gray tank, but also helps keep the cassette tank relatively clean.

Hopefully, this short article has been informative and helpful. As you can see, the pros and cons of the cassette toilet are equally compelling and significant. Like all options it comes down to personal preference and what’s important to you. Fortunately, if you’re interested in getting an RV with a cassette toilet then you’re in luck. The cassette toilet is the industry standard in nearly all caravans and motorhomes in Europe, Australia and New Zealand. Here in the U.S., however, cassette toilet availability is pretty much limited to truck campers though a few high-end manufacturers, like Earthroamer, offer it as an option as well. Truck camper manufacturers that either offer the cassette toilet as standard equipment or as an option include Northstar Campers, Phoenix Campers, Alaskan Campers, Hallmark, Four Wheel Campers, Livinlite, and Palomino.

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About Mello Mike 312 Articles
Mello Mike is an Arizona native, author, and the founder of Truck Camper Adventure Magazine. He's been RV'ing since 2002, is a truck camper and Jeep enthusiast, and has owned and restored several Airstream travel trailers. He enjoys college football, hiking, travel, off-roading, photography, and fishing. He retired from the U.S. Navy in 2004 as a CWO3 after 24 years and now works as a project manager for a major banking and security firm. He also does some RV consulting and RV inspections on the side.

8 Comments on RV Cassette Toilet Pros and Cons

  1. I use a 5 gallon bucket for the grey tank. If dumping at a dump station I just drain it into bucket, dump the bucket and repeat. We keep the bucket in the bathroom, usually stuffed with plastic bags that we use to collect our trash.

    Using the cassette to transport the grey water is a good idea, although we seem to dump the grey tank more often than the cassette so not sure if that is practical in our case.

  2. Nice article Mike. Any advice on where to purchase a second tank? While searching for the unit I purchased retail, very few dealers knew what a cassette toilet was and Thetford will not sell to the public. I eventually purchased a unit from overseas; still cheaper than anywhere in the U.S.

    • Hi Mike. Thetford, I hear, sells only to dealers, so I would purchase another cassette through one of the truck camper manufacturers that offer it as an option. That list is at the end of the article.

  3. Thanks for the tip. Didn’t even think about just dumping my gray water into the toilet and dumping via the cassette. So do you carry a 5gallon bucket? Now I have room for a fishing pole!

    • Hi Frank. Actually, this is what I do. I remove the cassette from the holding bay and run a garden hose from the gray water drain down into the cassette. I replaced the OEM drain cap with one that has a garden hose fitting on the end.

  4. I don’t have a cassette toilet, but I always thought a con would be that it limits your days you can go boondocking without breaking camp. Every year I go camp on the beach for a week, too far away from pit toilets to walk. What do you do if you want to stay in a remote location for more than 5 days?

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