Disclosure: We own Dupree Products, which makes Treatzall. We used it for years before we bought the company. That is the point of this review, not a footnote.
Holding tank treatments are a crowded aisle of blue liquids, perfume bombs, and formaldehyde leftovers. Most of them exist to make the toilet smell like something else. Treatzall exists to make the tank stop smelling like a tank.
We have used it since before Dupree was ours. Entertainer coaches buy it by the case for the same reason: no touring band wants to smell sewer. It has been around since the 1980s, it still has a following that hunts it down, and the job is simple. Liquefy the waste. Kill the odor. Don't cake in the toilet. Don't perfume the coach.
What it actually is
Treatzall comes as small balls. One scoop treats 50 gallons. A single container does that 40 times, which is why a $40 jar lasts a weekend warrior a long time and why people who live in the rig buy the case.
The formula is odorless and colorless. No dyes, no perfumes, no formaldehyde. It is biodegradable and labeled as septic-safe. The thing people mention first, once they have used it, is that it does not clump. A lot of tank treatments cake in the bowl or sit in a lump at the bottom of the tank. This one doesn't.
Why entertainer coaches care
A bus that hauls a band is a small house with a sewer on board, parked behind venues, lived in by people who cannot just open the windows and hope. If the black tank smells, the whole coach smells. There is no "we'll dump in the morning" when you have a load-in at 2 p.m. and six people sleeping on top of the tank.
Those coaches buy Treatzall by the case because it works. Not because the label is pretty. Not because it smells like cherry. Because the alternative is a bus that stinks, and that is not a professional option.
That is the same test we care about on the Wanderlodge and anywhere else we live with a holding tank. If it keeps a tour bus honest, it will keep a family coach honest.
What we use it for
Black tank, every dump cycle. One scoop in the toilet with water, then flush twice so it actually gets into the tank instead of sitting in the bowl. Same scoop down a sink or shower drain for the grey tank, with plenty of water behind it. The goal is not a scented bathroom. The goal is opening the valve later and not getting hit with a wall of sewer, and not fishing a cake of treatment out of the toilet.
It also helps with tank buildup over time. Those balls liquefy waste, which is a maintenance job, not a cover-up job. That matters more the longer you live with the same tanks.
What it is not
It is not a perfume. If you want the blue stuff that makes the bathroom smell like a gas station urinal cake, this will disappoint you. We consider that a feature.
It is not new, and it is not a secret lab formula we invented last year. Dupree added Treatzall in the 1980s. For a long time it was annoying to find, which is why the people who used it tended to stay with it and order in bulk. We sell it on Dupree and it is on Amazon now. That part is new. The product is not.
And yes: we own it. Read the rest of this site. We also tell you when a Wera wrench slips and when a "marine" speaker falls apart. We used Treatzall when it was someone else's product. We kept using it. Then we bought the company. That sequence is the review.
How to buy it
A jar is $39.99. A case of 12 is $350, which is how the coaches that actually live on the road buy it. Three or more jars on the Dupree site discount 10%.
If you already run a Twis-Loc, this is the other half of not thinking about the sewer: a valve you service instead of replace, and a treatment that does not cake or perfume.
The bottom line
Treatzall does one job and has done it for forty years. It liquefies waste, it keeps the odor down, it does not cake, and it does not try to smell like candy. Entertainer coaches buy it by the case because a stinking bus is not optional. We used it before we owned Dupree for the same reason.
If you camp two weekends a year and dump at the gate, almost anything will muddle through. If you live in the rig, or you haul people who will notice, this is the one we put in the tank.
- We used it for years before we owned the company
- Liquefies waste instead of covering the smell with perfume
- Does not cake in the toilet or the tank
- No dyes, no perfume, no formaldehyde
- One scoop per 50 gallons; a jar lasts, a case is how full-timers buy it
- The entertainer-coach test: nobody on that bus wants sewer
- We own Dupree Products, which makes Treatzall
- No perfume, no blue dye -- that is the design, not a missing feature
- Small balls and a scoop, not a drop-in pod
Where to buy
Treatzall is made by Dupree Products. We also sell it on Amazon.
- Treatzall on Dupree Products — jars and case of 12
- Treatzall on Amazon
