Raritan K.O. Kills Odors Bio-Active Holding Tank Treatment - 32oz Bottle

I have tried all the brands and this is the only one that actually works. No one likes the smell of POO when the toilet flushes. Be done with the 💩 smell forever !!

This spray did a good job of masking any minor boat lav smells. Well worth the purchase price.

Excellent product

Must require more tank venting than the 20 gal holding tank on my Hunter 34 sailboat has. Simply does NOT orevent odor at all. NoFlex Disgester granules from Zaal works much better.

This is not the product advertised. Beware.

Excellent product used it 1 time and the stains and odors are gone!

We’ve used KO in our holding tank for decades and it works , which is the most important thing for a holding tank “chemical”. It’s a bit more expensive than some alternatives, but we use about 2 cups in our 80 gallon tank and very rarely need to add more before pumping out. Be aware that you MUST flush your tank of other chemicals before starting with KO, and your tank needs to have good airflow. This must have oxygen to work properly. Years ago we added an additional vent to the top of our tank so that air flowed freely both in and out. We just sold our houseboat and left a bottle of KO for the new owners.