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Liquified – The Tank Treatment System That’s Changed How We Deal With Black and Gray Water

If you’ve spent any real time living out of a rig — whether that’s a Sprinter conversion or a Class C like our Dynamax Isata 5 — you already know the truth nobody puts in the brochure: tank management is the least glamorous, most important system in the whole build. Suspension geometry and roof-top tent setups get all the attention online. Nobody posts a reel about their black tank. But get it wrong, and it doesn’t matter how nice your galley or your solar array is — the whole rig smells like a rest-stop bathroom, and every guest knows it the second they climb in.

This is genuinely one of those unglamorous upgrades that’s made a bigger day-to-day difference than most of the gear we write about. We plan to use Liquified RV Toilet Treatment for the black tank and their companion Gray Tank Treatment for the gray side going forward. Two different rigs — two very different tank setups, two very different usage patterns — we think Liquified is worth a proper look.

The Problem With Many Tank Chemicals

Traditional blue tank chemicals were built for one job: masking odor with a stronger smell and loosely breaking things down with formaldehyde-based compounds. They work, kind of, until they don’t — tanks still build up solid waste and toilet paper along the walls, tank level sensors get coated in gunk and start reading full when they’re empty (or empty when they’re not), and the “clean” scent is really just a fight between two different bad smells.

Liquified takes a different approach. Both the toilet treatment and the gray tank version are enzyme- and bacteria-based formulas designed to actually digest waste, toilet paper, soap scum, and grease rather than just cover the smell. The company manufactures everything in Elkhart, Indiana, and the formulas are biodegradable, septic-safe, and free of formaldehyde — which matters if you’re dumping at public stations or boondocking near sensitive land, and matters even more if you’ve got kids or pets in the rig.

Black Tank: Orange or Lavender, Your Call

The toilet treatment comes in two scents — orange and lavender — and functionally they’re identical formulas, so the choice really is just personal preference. We’ve run both between the two rigs and honestly can’t say one outperforms the other on odor control or breakdown; it comes down to whether you want your bathroom smelling like citrus or a linen closet.

Dosing is simple: one ounce per 40 gallons of tank capacity, doubled if you’re camped somewhere pushing past 85 degrees, which happens more than we’d like on summer desert runs. The 16 and 32-ounce bottles come with a built-in measuring chamber on the spout, so there’s no fumbling with a shot glass or guessing a pour — you squeeze the bottle, fill the chamber to the line, and dump it in the bowl. It’s a small design detail, but after years of eyeballing powder packets, it’s the kind of thing that actually gets used consistently instead of skipped because it’s a hassle.

The bigger payoff, for us, has been sensor accuracy. Both the Sprinter and the Isata 5 have suffered from the classic “tank is full” false reading long before it actually was, which is one of the most common and most annoying RV sensor complaints out there. That’s almost always sensor probes caked in residue rather than a wiring issue, and consistent enzyme treatment has noticeably cleaned that up on both rigs over repeated dump cycles. It’s not an instant fix if your sensors are already heavily fouled — that takes several treatment cycles to work through — but the trend has been in the right direction.

Gray Tank: The One Most People Skip

Here’s the thing about gray tanks: almost nobody treats them, and almost everybody should. Grease, food particles, soap residue, and hair build up in there just as readily as anything happens in the black tank, and a surprising amount of “black tank smell” people complain about is actually coming from an untreated gray tank instead — especially in rigs like the Isata 5 that route both a kitchen sink and a bathroom sink/shower into the same tank.

The lemon-scented Gray Tank Treatment is built for exactly that dual-source problem — cutting grease and food debris from the kitchen side while handling soap scum and mildew-prone buildup from the bathroom side. We started using it more out of curiosity than necessity, and it’s turned into one of those products we now consider non-negotiable on every trip. If you’ve got a gray tank on your rig and you’re not treating it, that’s genuinely worth changing.

Who’s Behind It

It’s worth knowing where this stuff comes from, because it shapes why it works. Liquified is the product line to come out of Matt’s RV Reviews, the YouTube channel run by Matt Foxcroft, who’s built a following on blunt, no-nonsense RV product testing rather than polished sponsor-friendly reviews.

After years of putting every tank treatment on the market through its paces on camera and coming away unimpressed, Foxcroft teamed up with business partners Wil and Jen Knowles to build something better instead of just reviewing what already existed. The formulation process was driven by that same testing mindset — figure out what actually breaks down waste and kills odor at the source, rather than what markets well on a bottle label.

The company is still based in Elkhart, Indiana — the manufacturing hub of the RV industry — and has grown from a small operation into a full team handling formulation, wholesale, logistics, and customer support. The stated goal is a simple one: change the reputation of an entire product category that’s historically overpromised and underdelivered, one clean tank at a time. Having used the products across two very different rigs, that’s the part that tracks — this reads less like a company that stumbled into RV accessories and more like one built by people who were genuinely annoyed by the alternatives.

The Honest Trade-Offs

No product is perfect, so a few things worth knowing before you buy. These aren’t cheap by tank-chemical standards — you’re paying a premium over generic tablets or powder, and if you’re running a big rig with back-to-back trips, that cost adds up over a season. They’re also not a substitute for actually flushing your systems properly; enzyme treatment breaks things down, but you still need adequate water volume in the tank for it to do its job, and it won’t rescue a tank that’s already badly clogged or crusted without a few repeat cycles to work through.

And the company recommends avoiding bleach, antibacterial products, or harsh chemicals alongside it, since those can kill off the very bacteria doing the work — so if that’s part of your current routine, you’ll need to break the habit.

Bottom Line

Between two very different platforms — a compact Sprinter conversion and a much larger Class C motorhome — the results are less odor, easier dumping, and tank sensors that behave the way they’re supposed to. It’s not the kind of upgrade that photographs well for social media, but it’s the kind that actually changes how a trip feels day to day. If you’ve got a black tank, a gray tank, or both, this is one of the simplest, most overlooked upgrades you can make to your rig.