Welcome to Do-It-Yourself Pest Control

Contrac Blox

More Views

Contrac Blox

Availability: In stock

Contrac Blox is a single feed bait rodent bait (Bromadilone) that is weather resistant. Contrac Blox is an excellent clean-out and maintenance bait to control mice and rats, including warfarin-resistant Norway rats.
Contrac Blox- 18 lbs

Contrac Blox - 18 lbs.

  • Buy 2 for $73.55 each and save 4%
  • Buy 4 for $71.75 each and save 6%
  • Buy 12 for $68.14 each and save 11%
Contrac Blox- 18 lbs

Contrac Blox with Lumitrack - 18 lbs

  • Buy 2 for $76.20 each and save 5%
Contrac Blox- 18 lbs

Contrac Blox Rodent Bait - 4 x 4 lb

  • Buy 2 for $90.04 each and save 3%
Contrac Blox- 18 lbs

Ambush Bait Stations (6) & Contrac Blox (18 lbs) Kit



Contrac Blox - High Bait Acceptance With Rodent Control

Contrac Blox with bromadiolone has one of the highest bait acceptance of all our professional rodent baits. Bromadiolone is a single feed bait, that causes death after one feeding. Contrac Blox is the most palatable bait block on the market. Contrac Blox is made from a blend of food-grade ingredients with a paraffin coating. This process results in an all-weather bait that is highly palatable. It works in both dry and wet conditions. As one of the top products used by professionals, it has unsurpassed in rodent acceptance and control. Contrac Blox is popular as both a clean-out and maintenance rodent bait, working even against warfarin-resistant Norway rats.

Extrusion Process & Bait Shyness

Manufactured with Bell's extrusion process, Contrac Blox has multiple edges that appeal to a rodent's desire to gnaw. Rodents can consume a lethal dose in just one feeding. Bait shyness is not a problem with Contrac Rodenticide because mortality occurs a few days after bait is consumed.


  • Contrac Bloxes are 1 ounce blocks with a center hole. Contrac Blox is colored blue for easy recognition as a non food item.
  • EPA passed new rodenticide regulations in June 2011. Contrac Blox can only be sold in 16 lbs or more.
  • As an alternate choice, Fastrac Blox and Terad3 Blox are not effected by the new regulations and can be purchased in 4 lb containers.

Contrac Blox Features

  • Available in 4X4 lbs and 18 lb pails
  • Enough bait blox to kill hundreds of rats and mice
  • Each block has a hole in it to anchor into a bait station
  • Kills rats and mice in a single feeding
  • Contrac is also less toxic to non-target animals, in both primary and secondary poisoning situations, than other single-feeding anticoagulants. The antidote, Vitamin K1, is readily available and there is a time factor for treatment.
  • Tamper-Proof Bait Stations are recommended to protect the bait from non-target animals such as dogs and cats.
  • May be used inside or outside, within 100 feet of man-made structures.

Contrac Blox with Lumitrack

Contrac Blox with Lumitrack has an additive that causes rodent droppings to glow a bright green color under an UV light. Contrac Blox with Lumitrack contains the active ingredient, Bromadiolone and an additional preservative that inhibits mold growth even under the most humid conditions.

Additional Information

Additional Information

Pro Tips Contrac Blox has been the most consistent rodent bait over the years, showing impressive results. I don't know what it is, but the rodents love it. Dogs love it as well, so make sure you use a tamper resistant bait station with all rodenticide. If you need recommendations on bait stations, look at the choices below or call us. For 3 extra bucks you can get the Contrac with Lumitrack . Lumitrack, used with a black light reveals rodents droppings when searching in the dark. All of the bait we sell is fresh. Rodents love fresh bait.

California has placed Contrac Blox in a restricted use category. We can not ship Contrac to California without a pest control license. If you are a pest control operator or a certified applicator in California, please call us with your license number. Other single feed baits (non anticoagulants), such as Top Gun, Fastrac, and Terad3 are available in all states.
Packaging 4 x 4 lbs, 18 lbs
Manufacturer Bell Labs
Product Label Contrac Blox Product Label
MSDS Contrac Blox MSDS
Target Pest

Rodents Mice and Rats

Active Ingredient (s) Bromadiolone .005%
For Use :

Inside or Outside

  • May be used inside or outside, within 100 feet of man-made structures.
  • Agricultural and animal production facilities, warehousing and food processing plants, as well as for commercial, industrial, and residential accounts;
  • For ease of use, the pre-measured 28g BLOX has a hole in the center which lets technicians place it on bait securing rods in tamper-resistant bait stations. It can also be nailed or wired to rafters and ceilings or placed in tight locations.


Rats: Place 3 to 16 Contrac Blox (usually at spaces of 15 to 30 feet) per placement. Continue to supply fresh bait for at least 10 days or until rat activity ceases.

Mice : Place 1 block per placement. Space placements at 8- to 12- foot intervals. Two Contrac Blox may be needed at points of very high mouse activity. Maintain an uninterrupted supply of fresh bait for at least 15 days or until signs of mouse activity cease.

Rats and Mice: Replace spoiled or contaminated bait immediately. Dispose leftover bait and dead animals properly. In order to use rodent bait most efficiently, eliminate sources of water, food and harborage areas where possible. Repeat treatment if there is a rodent reinfestation. Use permanent rodent bait stations, supplied with Contrac Blox when there is a continuous source of infestation.

Contrac Blox can only be used for to control rat and mice infestations in and within 100 feet of man-made structures. Fence and perimeter baiting, beyond 100 feet from a structure as defined above, is prohibited. This product must not be applied directly to food or feed crops. Burrow baiting with Contrac All-Weather Blox is prohibited.

Yield 16 lbs yields about 256 x 1 ounce blocks; 18 lbs yields about 288 x 1 oz blocks
Mixture|Application Place bait where there is rodent activity. For safer use, use Tamper-Resistant Bait Stations
Application No
Retreatment Maintain an uninterrupted supply of fresh bait for at least 15 days or until signs of rodent activity cease. If reinfestation does occur, repeat treatment.
Shipping Restrictions CA
More Instructions
  • Pre-measured CONTRAC BLOX come in the popular-sized BLOX (1 oz., 28g, 15g) which work well placed in tight locations, nailed to rafters or ceilings, or in Bell's tamper-resistant bait stations.

Customer Reviews 16 item(s)

Bait with Stations work like a charm
Had significant activity in my yard, attic, and walls. This bait, with the bait stations, worked awesome and as advertised. Found one dead mouse in a bait station, and it appeared that the anticoagulant worked as advertised (without getting into too much gory detail).

I would buy this again, but might not have to, as a bucket is going a long way!
Review by John S / (Posted on 1/6/2015)
Will not buy again
I would not buy Lumitrak again. Thought it would be interesting to get this bait that leaves a trail. But it appears not to be as effective as the regular Contrac Blox,
Review by CrewCab Daddy / (Posted on 12/20/2014)
The bait arrived at the farm and we put the bait out on a wire within a cage and they were eating on it pretty steady for the last 3 weeks and now it seems like it has slowed down. Hopefully this will get rid of the mice and rats eating the wiring within the farm machinery and cars parked in the pole bar. This facility stores large combines and tractors and old antiques so we want the equipment safe from the destruction of mice and rats. I have used other pest control products from this company and they really work excellent.
Review by Kat / (Posted on 10/16/2014)
I use this product a lot. It is good if rats eat it. But sometimes rats do not eat it. Or they still alive after I put I put the poison around.
Review by Jackie / (Posted on 10/14/2014)
Great stuff - couldn't be happierd
I am on my third bucket of blox and I couldn't be happier. I use them in our barn in a large bait station and the mice have not gotten in our motorhome or boat in years. I keep the large bait traps around for the pack rats and the small traps in the motorhome for any mice that may make their way in for a warm place to sleep. I used to buy decon but I couldn't keep up. They would pack it away and I still had mice. . The blocks make it so they have to eat it a little at a time and a little bit kills them quick. I do recommend the blocks regularly to anyone I hear has a rodent problem. The bait traps and bait are the same traps the pest control company set at a friends house and charge her $45.00 a month to come check and reload! Works on chipmunks too. Pretty much any destructive rodent.
Review by Aspen Trash / (Posted on 9/29/2014)
Excellent product
This is a killer product... kills mice and rats in no time flat. I use it in the basement and in a garage that borders a field where the mice like to hang out and come in the garage to hibernate in the winter - they hibernate all right DEAD..
Review by Paul / (Posted on 7/25/2014)
this stuff is great for mice I couldn't do without it
this stuff is great for mice I couldn't do without it
Review by rooster / (Posted on 2/15/2014)
Contrac Blox
I've been using it in the back yard for eight years with the feeding stations. Have not seen alive rodent since. Having pets in the home the feeding stations are a great way of protecting them from the Contrac Blox.
Review by Skip / (Posted on 1/30/2014)
Did the trick!
Eating thru the wires of our HVAC system (under the house; in a rural area). Between a better sealing of the house & this bait, situation is finally under control!
Review by KK / (Posted on 12/2/2013)
Contrac Blox
Works great - took care of the mice problem in my basement quickly and easily.
Review by Mary Ann / (Posted on 11/25/2013)
The BEST on the market
We bought this for my sister living in Fla. She lives on the canal there in Hallandale. The RATS were so bad they ate through the floors the roof & the walls at night. At times she would wake up & the rats would be starring at her....
We sent her 18 bricks. She could not believe it there were so many dead rats because after they would eat this I guess it made them thirsty when she would go by the canal there were so many rats she called the city health Dept...
Now she replaced the floors the roof she does not live without this product it's the BEST ON THE MARKET.....
Review by J-R / (Posted on 11/13/2013)
Great Rat Killer
I have been using Contrac Blox for years and didn't know it. My overpriced pest control company was soaking me! I found this site and ordered and have saved myself a lot of money by doing so.

This stuff works. After you get this instead of the regular color rat droppings you will see just a few droppings that look exactly like the block. When you see that put your mind at ease. Dead Rat Walking!

It works trust me!
Review by RatKiller / (Posted on 11/4/2013)
Another great product!
If you have rodent issues, this is the product for you!!!
Works like a charm!!
Review by Affordable Storage Solutions / (Posted on 10/28/2013)
Excellent Rodent Stopper
Once I place the bait blocks where they need to be, the noise stops within a week.
Review by VG / (Posted on 3/1/2013)
Great Bait
I had a huge rat problem , tried a boat load of traps, nothing worked until I got Contrac....great bait. Killed all my rats !
Thanks Review by Donna Gray / (Posted on 1/23/2013)
Kill rats
Wow, I called these people and they said the rats really like contrac
and they were right. I got rid of my problem inside of two weeks.
Review by Pops / (Posted on 12/5/2012)

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.