Camco 41197 TST Orange Holding Tank Treatment 1 Gal

If you've ever cracked open an RV that sat in the summer sun with a half-full black tank, you already know why holding tank treatment isn't optional. Camco's TST Orange treatment is what keeps that trip from turning ugly. It's a liquid you pour straight down the toilet, and it goes to work breaking down solid waste and toilet tissue so everything flows out clean on dump day.

The formula does two jobs at once. First, it digests waste and tissue so it doesn't pack up and clog the bottom of the tank. Second, it deodorizes, holding back odor for up to seven days on a single dose. That orange scent isn't perfume covering up a problem. It's the smell you get when the treatment is actually keeping the tank under control. For a weekend at the lake or a long stretch of full-timing, that's the difference between a tank you forget about and one you dread.

Dosing is simple. Two ounces treats a tank up to 40 gallons. A one-gallon jug holds 128 ounces, so you're looking at roughly 64 treatments before you need another bottle. That's a full season for most weekend campers, and it stores easily in a basement bay or under the sink. Pour it in after you dump, add a little water to the empty tank, and you're set for the next few days.

One thing we like about this formula: no formaldehyde. Some older tank chemicals lean on it, and a handful of states restrict formaldehyde-based treatments at dump stations because of how they hit septic systems. TST Orange skips it entirely and is septic-tank safe, so you can dump at home, at a campground, or at a marine pump-out without worrying about killing the bacteria a septic system needs to work.

It also lubricates your tank sensors. If you've owned an RV for more than a season, you've probably watched the black tank readout claim it's full when you just dumped it. That's usually gunk clinging to the sensor probes. Keeping a treatment like this in the tank helps keep those probes clean so the gauge tells you the truth.

Boaters, this one works for you too. The same formula that handles an RV black tank handles a marine holding tank. If your boat has a fixed head and a holding tank you pump out at the dock, a couple ounces after each pump-out keeps things civil below deck. Nobody wants that smell drifting up the companionway on a hot afternoon.

Why a gallon instead of drop-in packets or a smaller bottle? Cost per dose, mostly. If you camp more than a few weekends a year, the gallon is the cheapest way to stay treated. Measure two ounces with the cap or a small cup, pour it in, done. There's no mixing, no dissolving, no waiting for a packet to break down. The liquid goes to work the moment it hits the tank.

A few honest notes. This is a black-tank and holding-tank treatment, built for the tank that takes your toilet waste. Use it as directed and give the tank enough water to let the formula move around. And like any tank treatment, it works best when you dump on a regular schedule instead of letting a tank sit full for weeks. Treatment helps a lot, but it's not a substitute for a good dump routine.

Storage is easy. One gallon takes up about the footprint of a jug of washer fluid, so it tucks into a basement bay or a cockpit locker and stays out of the way until you need it. Keep the cap tight so the orange scent stays in the jug. For long-term winter storage, bring it inside like you would any liquid you don't want to freeze.

Camco has been building RV and marine sanitation gear since 1966, and the TST line is one of their long-running staples. It's a no-drama, do-the-job treatment. Pour it, forget it, dump clean. That's really all you want from a tank chemical.