Camco TST Blue Enzyme Holding Tank Treatment 8-Pack

The Camco TST Blue Enzyme treatment is the stuff you reach for when you want a holding tank that behaves the way it's supposed to. It's a biological, enzyme-based formula that digests waste, tissue, fats, and proteins right inside the tank, so solids break down instead of stacking up around the sensors and the dump valve. Each pack gives you eight single-use 4 oz bottles, and one bottle treats a tank up to 40 gallons. Drop one in, and you're set for the next week.

Here's what makes the enzyme approach different from the old chemical route. Instead of covering the smell with a heavy perfume, TST Blue puts live enzymes to work breaking the waste down at the source. Odor doesn't build because the material that causes it is getting digested. You get a clean scent, not a chemical cloud, and the tank empties cleaner when you pull the valve. It's the difference between hiding a problem and actually dealing with it.

And it's formaldehyde-free. That matters more than a lot of folks realize. Formaldehyde and other harsh biocides kill off the good bacteria in septic systems and dump stations, which is why plenty of campgrounds and marinas won't allow them. TST Blue skips all of that. No formaldehyde, no pesticides, no biocides. Every component is biodegradable and septic safe, so you can dump at any approved station without a second thought. If you spend time at places that post rules about tank chemicals, this is the kind of treatment they're asking for.

The formula also lubricates your tank sensors. If you've ever fought with a level monitor that reads full when the tank is nearly empty, you know the problem. Waste and paper cling to the sensor probes and throw off the reading. The lubricating action in TST Blue helps keep those probes clean so your gauge tells you the truth. Small thing, but it saves you a lot of guessing.

Using it is simple. After you dump and flush the tank, pour in one 4 oz bottle and add a few gallons of water to get the enzymes going. The treatment activates once it's diluted, then it goes to work digesting whatever comes next. One bottle holds odor down for up to 7 days on a tank up to 40 gallons. Big family or heavy use? You may want a second bottle, but for most weekend and week-long trips one does the job.

A quick word on the habits that make any tank treatment work better. Keep a little water in the tank at all times so the enzymes have something to live in and the solids stay suspended. Dump only when the tank is at least two-thirds full, so you get a strong flush that carries everything out. Do that, drop in a fresh bottle of TST Blue after each dump, and you'll rarely think about your holding tank at all. That's the whole point.

This works anywhere you've got a holding tank. It's built for RV black tanks, and it's just as at home in a boat's holding tank or a marine head. Portable and cassette toilets too. If it holds waste and you want it broken down and deodorized without harsh chemistry, TST Blue fits. The single-serve bottles are easy to stash in a storage bay or a dock box, and there's no measuring and no mess. Grab one, pour it in, done.

You're getting eight bottles in the pack, so that's roughly two months of weekly treatments or a full season of weekend trips before you need to restock. It's made in the USA, and it's the same kind of enzyme treatment plenty of full-timers and liveaboards keep on hand all season. Keep a pack in the rig and a pack on the boat, and you won't get caught with a smelly tank and nothing to fix it.