STF 4K High Traffic, Moderate Heat During moderate temperatures, STF 4K performs as well as our more potent syrups. It has the right amount of dye, fragrance and active ingredients to prevent odor causing bacteria from forming, even with high traffic. As with all our portable restroom deodorizers, the results are guaranteed! 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