How to Use Max 12-Month Roach Killing Bait by Combat
At a glance
- Efficacy: Workhorse
- Best job: Colony-level reduction of light-to-moderate small-roach activity when you deploy every station in the pack at once, concentrated near harborage
- Format: Enclosed insect bait station (child-resistant plastic disc), sold as a multi-pack for deployment throughout the home
- Technique: Easy technique
Does this product actually work?
A genuine workhorse for light-to-moderate small-roach pressure — the ceiling is placement density, not the chemistry.
Fipronil bait stations are the format university IPM actually recommends over sprays for roaches, and independent field trials back that up — one NC State study found a comparable fipronil gel bait cut baseline German-cockroach trap catch by roughly three-quarters within a month, a level surface sprays never approached. The chemistry does real, verified colony-level work through secondary transfer. Where this product succeeds or fails is almost entirely about density and placement: use every station in the box, concentrated tight to confirmed harborage, and keep sprays away from them, and it earns the workhorse grade. Spread a couple of stations thin across clean rooms and it will underperform — not because the bait failed, but because the technique did.
Best for
Knocking down light-to-moderate German/small-roach activity when every station in the pack is deployed at harborage, close to walls and corners.
Skip it for
A heavy, established German-roach infestation, or as the sole tool once you're seeing roaches in daylight or finding egg cases.
What it is — and what it's really for
The label is the law. Here's the honest read on the format, the one job it does well, and the job people wrongly buy it for.
The technique walkthrough
Where DIY succeeds or fails is in the placement, patience, and the small pro moves the label never mentions. Follow the label; these are the technique details on top of it.
This product rewards density and harborage-proximity above everything else — the single biggest lever in this whole cluster is using every station you were given, not spreading them thin.
Deploy every station at once
Open the full pack and place all the stations together in the first round — coverage density is what makes fipronil bait effective, not saving stations for later.
Common mistakeSetting out just one or two stations 'to see if it works' and holding the rest in reserve — that under-doses the whole strategy.Place at confirmed harborage
Set stations under sinks, behind toilets, behind and under appliances, and inside cabinets — the places roaches actually live, not just where you've seen one cross the floor.
Pro moveConcentrate stations within a few feet of confirmed harborage rather than spreading them evenly across clean rooms.Hug walls and corners
Set stations so they touch walls and corners — roaches travel edges, not open floor, and a station in the middle of a room will be ignored.
Common mistakePlacing stations in the center of cabinets or counters instead of tight to the edge.Add extras near hot spots
Where you find the heaviest activity, add additional stations a short distance from the first — the label supports this for concentrated pressure.
Pro moveTreat any spot with visible droppings, egg cases, or a strong roach odor as a hot spot worth extra density.Keep sprays and foggers away
Do not spray insecticide or set off a fogger anywhere near the stations — the label warns this contaminates the bait and repels roaches from feeding on it.
CautionBait and repellent chemistry work against each other; if you're using both, you're likely sabotaging the bait.Replace on schedule
Replace stations per the label's interval, or sooner if activity returns or a station looks dried out, dirty, or empty.
Common mistakeLeaving old, spent stations in place long past their active life and assuming they're still working.
Do & don't
- Deploy all stations together in the first round, not gradually.
- Place stations touching walls and corners near confirmed harborage.
- Add extra stations at the heaviest activity spots.
- Keep sprays, foggers, and cleaners away from stations.
- Replace per the label interval or sooner if activity returns.
- Don't hold stations in reserve — density from day one is what works.
- Don't place in open floor or the center of a room.
- Don't spray insecticide near or on the stations.
- Don't use just one or two against real activity.
- Don't expect it to solve a heavy, established German-roach infestation alone.
Where it works vs. where it fails
No product fixes everything. This is the honest boundary — the situations it genuinely handles, and the ones it simply won't.
Where it works
- Roach pressure is light-to-moderate and you deploy the full pack at once
- Stations are concentrated tight to confirmed harborage — under sinks, behind appliances, in cabinets
- You're using it as prevention after a professional knockdown, or in hard-to-reach cracks and voids
- No sprays or foggers are being used nearby to contaminate the bait
Where it fails
- The infestation is dense/established — consumer baiting density can't outpace the breeding rate
- Only one or two stations are deployed against real activity
- Sanitation is poor and competing food (crumbs, grease) beats the bait
- The problem is actually large/American roaches entering from outside, not small/German roaches
- Insecticide spray or fogger use nearby is contaminating or repelling the bait
Mistakes that waste the product
A few stations spread thin across the house
Foragers never encounter a station if coverage is sparse, so the bait sits unused while the colony keeps breeding.
Spraying insecticide near the stations
The label itself warns that spray or fogger contamination repels roaches from bait they'd otherwise feed on, wasting the product.
Leaving crumbs, grease, or food out
Competing food sources beat the bait for attractiveness, so roaches feed on your kitchen instead of the station.
What to expect — and when
This bait works on a colony-transfer timeline, not an instant-kill one — judge it over one to two weeks, not the first evening.
Hours to a few days
Visible dead roaches near stations as foragers feed and die from direct exposure.
Days 3-14
Meaningful population decline as secondary transfer — roaches feeding on contaminated feces and carcasses — spreads the effect through the colony.
After 2-3 weeks
Activity should be markedly reduced; persistent or unchanged activity at this point signals a population beyond what consumer baiting density can finish.
When to stop DIY & call a pro
Consumer bait density is built for a modest roach population — against a fast-reproducing German-roach infestation, the stations simply can't be placed thickly enough to win. These are the honest triggers:
Roaches are seen in daylight
German roaches are largely nocturnal; daytime sightings usually mean the harborage is overcrowded enough that individuals are being pushed into the open — a sign of an established population.
You find egg cases (oothecae) around the home
Visible egg cases point to active breeding outpacing whatever control has been applied, not a population that's declining.
Activity persists or rebounds after 2-3 weeks of correct, dense baiting
That's enough time for fipronil's colony-transfer effect to show; continued activity means the infestation has exceeded what consumer-density baiting can finish.
You're seeing large roaches (American/waterbugs), not small German roaches
This product targets small roaches — a different species mix needs a different bait and often points to an outdoor entry source worth a professional inspection.
When correct, dense fipronil baiting still isn't closing the gap, Anchor's licensed NH technicians combine professional-grade baiting with harborage inspection to finish what a consumer pack can't. Free inspection, same-day service across southern and central New Hampshire.
Roaches still active after correct, dense baiting?
Is it safe for pets & kids?
The short version lives here; the full per-species verdict lives on this product's pet-safety page.
The child-resistant enclosed stations keep the fipronil bait away from little hands, but they should still be kept out of reach of children and pets as a rule — the bait inside is a genuine pesticide. The label also prohibits use in or near beehives.
Re-entry: No general re-entry wait is required for the enclosed stations themselves, but keep children and pets from handling, chewing, or prying open any station.
Roaches in southern & central New Hampshire
German cockroaches cannot survive New Hampshire's cold outdoors — they're strictly an indoor, heat-dependent problem here, which means any activity you find is coming from inside the structure, not a seasonal outdoor population reinvading. That makes a full, dense deployment of this bait especially effective in NH homes, since there's no outdoor reservoir constantly reintroducing roaches the way there might be in warmer climates. If activity persists after correct, dense baiting, Anchor Pest Services serves Manchester, Nashua, Concord, and the surrounding towns with licensed roach treatment that reaches harborage a consumer bait pack can't fully cover.
Service area
Southern New Hampshire
Anchor Pest Services · NH license #782664 · NEPMA member · family-owned since 2017.
Frequently asked
Sources & further reading(4)
- [1]EPA Pesticide Product Label — Combat Source Kill Roach Killing Bait (fipronil 0.03%), Reg. No. 64240-33
Verified active (fipronil 0.03%), station placement and 'do not spray near bait' directions
epa_labelverified 2026-07-14 - [2]UC IPM — Cockroaches (Home & Landscape)
Insecticide sprays alone will not eliminate cockroaches; baits are the university-endorsed primary control tool
extensionverified 2026-07-14 - [3]DeVries et al., BMC Public Health (2019) — 'Bed bugs, house dust mites, and german cockroaches...' field trial
Fipronil gel bait cut baseline German-cockroach trap catch by roughly three-quarters within a month in an in-home field trial
academicverified 2026-07-14 - [4]Combat / Henkel — Max 12 Months for Small Roaches product page
Product format, deployment directions, labeled pest list (facts only, not the efficacy verdict)
manufacturerverified 2026-07-14
Written & reviewed by
VerifiedDaniel Brady
NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)
Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.
Last updated July 2026
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Professional Pest Control
When Consumer Bait Density Hits Its Ceiling
Fipronil bait stations genuinely work, but a retail pack has a density limit a heavy infestation can outgrow. Anchor Pest Services treats the harborage a consumer bait pack can't fully reach, across southern and central New Hampshire. Family-owned since 2017, NH license #782664.
- Professional-density baiting plus harborage inspection
- NH-licensed applicators (#782664)
- Free inspection — same-day service across southern NH
NH License #782664 · No obligation · We answer in person
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