Single-dose Floral Flush RV Toilet Treatments require no mixing or measuring to eliminate odors and break down waste in your RV waste holding tank or portable toilet. Each 4-ounce bottle treats up to 40 gallons. This product contains no formaldehyde, is non-staining and is safe for septic tanks. Comes in unique retro-style packaging that looks great in your RV bathroom. Each pack contains (6) 4-ounce single dose bottles.