Valterra Odorlos V77002 Holding Tank Treatment (40oz Self Measuring Bottle),1 Pack

This product is incredible. Absolutely no odor coming back up into our bathroom in our RV. When we bought the RV there was actually a foul odor coming up from the bathroom sink which happens to lead to the black tank. Our unit was a rental that we purchased. After using this stuff it took about a week but there was no more odor coming up from the bathroom sink. Also after dumping the black tank and unhooking there is little to no odor left in the tube.

Great product. Have used it for years . Seems to do as advertised.

Ladies and gentlemen, hold your noses and prepare yourselves for a hilarious adventure in the world of Odorlos V77003 Holding Tank Treatment. It's like the superhero of bathroom odors, swooping in to save the day when things get a little too stinky.Now, imagine this: you're embarking on an ocean voyage on your new sailboat, ready for an epic adventure with your family or friends. The open sea beckons, and the world is your oyster. But there's one thing lurking in the shadows, threatening to turn your journey into a fragrant nightmare—the dreaded holding tank odor. Cue the dramatic music.But fear not, for in your arsenal of travel essentials lies the magical elixir known as Odorlos V77003 Holding Tank Treatment. It's like a secret weapon against the forces of bathroom odors, a potion that promises to make your holding tank smell like a field of fresh flowers. Well, at least in theory.You unscrew the cap of the Odorlos bottle, taking in a whiff of anticipation. Will this tiny solution really deliver on its promises? You pour it into your toilet, feeling like a mad scientist concocting the perfect formula to defeat the odor monsters. You flush, feeling a sense of accomplishment. Let the battle of the odors begin!May your journeys be filled with laughter, fresh air, and a touch of bathroom alchemy. Here's to defeating the odor monsters, one holding tank at a time!

Never thought I’d write a review on RV holding tank treatment but Odorlos is fantastic.We’ve tried so many over the years and some are better than others but none have totally controlled odor AND dissolved solids in the tank.Our tank sensors are working for the first time since we purchased the RV and there were no visible solids or tissue when dumping the tank ( we have a clear elbow fitting which allows us to see when flushing tank with water). There is little to no odor when dumping tank and that is amazing in itself!Follow instructions- don’t use more than the recommended amount for your tank as it’s not necessary!you’ll be pleased with the results!

This works the best out of the few liquid ones we’ve tried. It’s a little more but it works better.

This is the product I use in my camper

Really impressed with the quickness that this removed smells from our black tank. We camp every month or two and leave about 5 gallons of water in our tanks. Last treatment we tired really didn't hold up in summer months and left a big stink after sitting for 6 weeks. After flushing our tanks repeatedly and using this our tank smell went away in about 24hrs. Pretty impressive. After being parked for a month we are getting no smells in the camper. Good stuff.

The 64 oz. bottle of Odorlos is easy to use and easy to store in the RV. One nice thing about it is there is NO odor, it is odorless.I didn't rate the "softness" as I'm not sure what that means, it's a liquid tank treatment.I've used this product for years. We live in a rural area, and I have the RV set up for a guest house when we are not traveling. Our property is on a septic system for wastewater, and one needs to use some caution about what goes down the drain. Odorless is septic tank safe, many of the RV tank products are not.