00119 KILLEM BIOCIDE 16 OZ. BOTTLE, TREATS 1920 GALLONS OF DIESEL FUEL PER BOTTLE

What It Is

This is a concentrated biocide additive for diesel fuel systems, designed to kill and prevent microbial growth (algae, bacteria, fungus) in fuel tanks. It’s for any diesel-powered lawn mower, tractor, or equipment that sits for extended periods or uses stored diesel.

Fitment & Compatibility

No mechanical fitment checks needed—this is a chemical additive, not a physical part. Before use, confirm your equipment uses diesel fuel (not gasoline or kerosene). Works with all diesel engines, including those in zero-turn mowers, riding mowers, compact tractors, and commercial mowers. Compatible with ULSD, biodiesel blends, and standard diesel. One 16 oz. bottle treats up to 1,920 gallons of diesel—measure your fuel tank capacity to avoid overdosing. For a typical 5-gallon mower tank, you need about 0.04 oz. (a few drops). Use a syringe or small measuring cup for accuracy.

Key Things to Know

• Quality & effectiveness: Highly rated (4.6/5) and widely trusted for killing existing microbial slime and preventing new growth. Works fast—often clears clogged filters within one tank.
• Installation difficulty: Easy—just pour into the fuel tank before filling with diesel. No tools required. Shake the bottle before use.
• Common gotchas: Overdosing won’t harm the engine but wastes product. Underdosing may not kill all microbes. If you have severe contamination (thick sludge), you may need to drain and clean the tank first, then use this as a follow-up treatment.
• Storage: Keep bottle tightly sealed and store in a cool, dry place. Shelf life is typically 2-3 years.

Should You Buy It

Buy this if you store diesel equipment for weeks or months between uses, notice fuel filter clogs, or see black slime in your tank. It’s a cheap, one-bottle solution that prevents costly filter replacements and fuel system repairs. Not needed if you burn through fresh diesel weekly and never let equipment sit.