Aquabac Xt – Midge Flies in Wastewater


Aquabac Xt* is a highly effective, US EPA-registered biological larvacide.

It contains a species of bacteria called bacillus thuringiensis, an approved larvacide for controlling red worms and midge flies in wastewater treatment plants and waterways.  Aquabac Xt can either be poured into the head of your plant or before the clarifier, depending on where you have the problem.

If left alone, the midge flies will cause poor setting, high TSS and disrupt the bacterial environment.

This is a highly effective technology and is a nice alternative to Strike.™ Aquabac Xt has also been proven effective against Bristol Worms (Aeolosoma sp.) in the field.

Not registered for use in the state of New York.

5 Gallon Case (two 2.5 gal jugs) ($63.00 per gal)


Out of stock



Midge Fly Impact on Wastewater

Midge flies, or chironomids (Chironomidae), commonly occur in wastewater treatment plants and pond systems.  The red worm that forms the midge loves the nutrient-rich conditions in a wastewater treatment plant and feeds off bacteria and sludge.  The worms will eat mixed liquor and once transformed into adults, clog filters and buildings entrances.  Some operators have told us they couldn’t see past their hand in some buildings.

Red worms, also called blood worms, are found in mixed liquor.  Over a period of ten days the eggs hatch into red worms and then pass through the pupa stage to become adult midge flies.  With no aquatic life to feed on the midges, their life cycle runs uninterrupted, and they multiply fast. If left alone midge flies will cause poor settling, high TSS, and disrupt the bacterial environment.

*There is no LC50 for aquatic organisms except for mosquito larvae.  All other organisms except nuisance flies and midges Psychoda, Chironomus, and Chironomine are not affected by the product.  Minnows, fish, Daphnia, even other aquatic insects can’t be killed by the active ingredient in the formulation.  AquaBac XT is specific to mosquito, blackfly and midge larvae and again is not toxic to anything in the application sites except the larvae of these targets.  The LC50 against susceptible mosquito larvae averages 0.15 micrograms per milliliter

Red Worm Midge Fly


  • Wastewater Plants
  • Pond Systems
  • Drain Lines


  • Kills Red Worms and resulting Midge Flies
  • Stops Red Worms from eating MLSS
  • Bacterial Based

Dosage Rate


Safety Data Sheet

Certificates Of Analysis available upon request.

Case Study – Aquabac Xt – Midge Flies

Blood Worms Midge Flies Hydrotech DiscfiltersChallenge: A 3MGD wastewater treatment plant in Wisconsin had an issue with blood worms and the resulting midge flies in their Hydrotech disc filters.  The filters were filled with worms and it got worse every day.

Solution: They added a large amount of our Aquabac Xt for Midge Flies before the filters and at the clarifiers.
Results: This took them out with one shot, and they now add a little every year to keep the midges flies out.


“Works slick, they got so thick in our sand filter building we could hardly breathe. AQUAFIX told us about the Aquabac Xt and it works.”-  Jeff, Illinois Wastewater

“We had bad red worms in our sand filters. Aquabac Xt knocked them out.” – Larry, Wisconsin Wastewater

Additional information

Weight 52 lbs
Dimensions 13 x 13 x 15 in
5 Gallon Case

5 Gallon Case ($63.00 per gal)


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