Valterra Odorlos Holding Tank Treatment - 40 oz. Self-Measuring Bottle

  • By Valterra
  • Model #V77002


$19.50 SAVE: $3.51

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When added to holding tanks, Valterra Odorlos Holding Tank Treatment provides the naturally occurring bacteria with a continuous supply of the best alternative energy source to pure oxygen…nitrates. This eliminates the need for bacteria to target sulfate for energy, and the result is no holding tank odors. It is safe and effective for RV and marine holding tanks as well as septic tank systems.

This self-measuring bottle makes it easy to pour the perfect amount every time. With both caps tightly closed, tip the bottle to transfer the liquid to the measuring chamber. Remove the cap from the measuring chamber and pour the liquid into your toilet, then flush into the holding tank.

For black or gray water holding tank systems, use 4-ounces of Odorlos plus 1-gallon of water to treat a 40-gallon tank. It is recommended to flush and empty the system weekly for optimal performance. To prevent odors/backup in a septic tank, use 16-ounces of Odorlos plus 4-gallons of water to treat a 1000-gallon tank. For portable toilets, use 2-ounces of Odorlos plus 1 to 2 quarts of water. Do not mix Odorlos with other holding tank products.


  • Valterra Odorlos Holding Tank Treatment
  • Size: 40 oz. Self-Measuring Bottle
  • Fragrance: Scent Free
  • Contents: Composed Mostly of Nitrate
  • Use 4 oz. Per 40 Gallon Black or Gray Water Holding Tank
  • Use 16 oz. Per 1000 Gallon Septic Tank
  • Use 2 oz. Per Portable Toilet
  • Effective in Extreme Temperatures
  • Accelerates Breakdown of Tissue & Waste
  • Prevents Hydrogen Sulfide Gases
  • Helps Prevent Clogs
  • Lubricates Valves
  • Formaldehyde Free
  • 100% Biodegradable
  • Non-Corrosive
  • Non-Toxic


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