Termidor SC mixes at 0.8 fluid ounces per gallon of water for the standard 0.06% termite treatment. The product label lists three approved dilution rates, each requiring a different amount of concentrate per gallon. Getting this ratio right matters because applying too little won’t create an effective barrier, and applying too much violates the EPA label, which is a legal document.
Mix Ratios for All Three Dilution Rates
Termidor SC contains 9.1% fipronil as its active ingredient. The label permits three finished dilution percentages, and the amount of concentrate you add per gallon of water changes accordingly:
- 0.06% dilution: 0.8 fl oz of Termidor SC per gallon of water
- 0.09% dilution: 1.2 fl oz of Termidor SC per gallon of water
- 0.125% dilution: 1.6 fl oz of Termidor SC per gallon of water
The 0.06% rate is the most commonly used for subterranean termite treatments and general perimeter pest control. The higher concentrations are sometimes chosen for heavy infestations or when treating soil types that absorb more chemical, like sandy or gravelly ground.
How to Scale for Larger Batches
Most termite jobs require far more than a single gallon of finished solution, so you’ll typically be mixing in a larger spray tank. To scale up at the standard 0.06% rate, multiply accordingly: a 25-gallon tank needs 20 fluid ounces of Termidor SC, a 50-gallon tank needs 40 fluid ounces, and a 100-gallon tank needs 80 fluid ounces (which is the entire 78-oz bottle, roughly). One 78-oz bottle of Termidor SC makes approximately 97 gallons of finished solution at the 0.06% rate.
For the 0.125% rate, those numbers roughly double. A 25-gallon tank would need 40 fluid ounces of concentrate, and you’ll go through product much faster.
How Much Finished Solution You Actually Need
Knowing the mix ratio is only half the equation. For termite barrier treatments around a structure, the standard application rate is 4 gallons of finished solution per 10 linear feet of trench, per foot of depth. If your foundation footing is 2 feet deep, that becomes 8 gallons per every 10 linear feet.
A typical home with a 160-linear-foot perimeter and footings 2 feet deep would need roughly 128 gallons of finished solution for a complete exterior trench treatment. At the 0.06% rate, that works out to about 102 fluid ounces of concentrate, or just over one full 78-oz bottle plus a partial second bottle. This is why many homeowners doing their own treatment buy two bottles.
For rod treatments under slabs, the same 4-gallons-per-10-linear-feet rate applies. The label requires thorough, continuous coverage to create an unbroken chemical barrier in the soil.
Mixing Steps
Fill your tank about halfway with water before adding the Termidor SC. This prevents the concentrate from sitting undiluted at the bottom. Pour in the measured amount of product, then fill the rest of the way to your target volume. Agitate or stir the tank to ensure even distribution. Termidor SC is a suspension concentrate (that’s what “SC” means), so the active ingredient particles are suspended in liquid rather than dissolved. Periodic agitation during application keeps the mixture uniform.
Use a measuring cup or graduated cylinder designed for pesticides. The difference between 0.8 and 1.6 fluid ounces per gallon is small enough that eyeballing it will throw off your dilution rate. A kitchen tablespoon is 0.5 fluid ounces, for reference, so the standard 0.06% rate is just over one and a half tablespoons per gallon.
Which Dilution Rate to Use
For subterranean termite prevention and treatment, 0.06% is the standard starting point and what most professionals use. It provides effective colony elimination through fipronil’s “transfer effect,” where termites that contact treated soil carry the chemical back to nestmates. Higher concentrations can actually work against this transfer effect by killing termites too quickly, before they return to the colony.
The 0.09% and 0.125% rates are more commonly used for severe infestations, retreatments, or challenging soil conditions. Sandy or very porous soils may warrant a higher rate because the chemical disperses more readily. When applying for general perimeter pest control (ants, spiders, and similar insects around the outside of a home), the 0.06% rate is standard.
Where You Can and Cannot Apply
Termidor SC cannot be applied to exposed interior surfaces like floors, walls, or baseboards. It is specifically labeled for exterior perimeter treatments and soil treatments. There are limited exceptions: you can inject it into wall voids, directly into infested wood members, into bath traps, and into soil beneath interior flooring. But spraying it on any surface people or pets will contact inside the home is not permitted.
For outdoor perimeter treatments targeting ants and other crawling insects, the application goes along the foundation and a few inches of adjacent soil, not broadcast across the lawn. The label restricts how far from the structure you can apply and limits the number of treatments per year. Always read the full label for your specific use case, since the rules differ between termite soil treatments and perimeter pest applications.
Shelf Life and Storage
Unopened Termidor SC remains effective for several years when stored at room temperature, away from extreme heat or freezing. Once mixed with water, use the finished solution the same day. Don’t store diluted solution in a tank overnight, as the suspension can settle and lose uniformity. If you have leftover mixed product, apply it to labeled treatment areas rather than dumping it. Fipronil is highly toxic to fish and aquatic invertebrates, so keep runoff away from storm drains, ponds, and streams.