Liquid Black Tank Treatment

Controls black tank odors with a versatile liquid formula

Available in a refreshing citrus fragrance

Citra-Fresh® brings the same trusted performance of Walex black tank deodorizers in a convenient, easy-to-pour liquid. Designed to start acting immediately to control black tank odors, this citrus-infused formula is perfect for RVers who want precise control over dosing.

With no biocides and no formaldehyde, Citra-Fresh® is a clean, eco-friendly choice for keeping your black holding tank fresh and fully functional—all while adding a refreshing citrus scent to your RV bathroom.

Available in 32oz, 64oz and 1-gallon.

Why Choose Citra-Fresh?

• Controls odors for up to 7 days
  • Keeps your black tank smelling clean and fresh between dumps.
• Starts acting immediately
  • Unlike bacterial formulas that take days to start working, Citra-Fresh controls odors right away.
• Fresh citrus fragrance
  • Leaves behind a pleasant, clean scent without being overpowering.
• Liquid format for adjustable dosing
  • Ideal for RVers who want more control or prefer liquids over drop-ins.
• Biocide-free and formaldehyde-free
  • Safe for RV plumbing, septic tanks, and environmentally sensitive areas​.

Instructions for Use

Black Tank

Add 2oz for up to 40 gallons. Add adequate water – 1.25 gallons for every 10 gallons of tank capacity. Adding an extra 2-4oz of Citra-Fresh is safe if desired.

Grey Tank

Add 2oz of Citra-Fresh down the sink drain and follow with 5 seconds of water.