STF 6K Extreme Traffic, Extreme Heat Along with the long-lasting, deep blue dye STF 6K contains the highest amount of fragrance and active ingredients of any syrup in our line of portable toilet deodorizers. This “super concentrate” formula will continue to fight odors and maintain its blue appearance in the worst conditions. Please refer to the Usage Calculator to determine proper dosage for the highest performance in any temperature. Order Online Request Information What Strength Deodorizer do you need? STF 3K | STF 4K | STF 5K | STF 6K