Best Drain Fly Killers

Drain flies are annoying, unsanitary and difficult to get rid of. We reviewed the top drain fly killer products to simplify your purchase decision.

Drain Fly Gel Reviews

Drain gels come in two forms, enzymatic or chemical. Their goal is to remove any organic buildup in pipes or blockages. This eliminates the fly breeding ground.

Rockwell - IBDC128 - InVade Bio Drain Gel -1 Gallon
AMERICAN BIO Drain Gel 128oz- Organic Bioenzyme Cleaner
Fruit Fly Goodbye Gel Drain Treatment | Drain Fly Killer | Fruit Fly Killer | Drain Flies Treatment | Fruit Flies Treatment | Drain Fly & Fruit Fly Eliminator (1 Gallon)
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Rockwell - IBDC128 - InVade Bio Drain Gel -1 Gallon
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AMERICAN BIO Drain Gel 128oz- Organic Bioenzyme Cleaner
Fruit Fly Goodbye Gel Drain Treatment | Drain Fly Killer | Fruit Fly Killer | Drain Flies Treatment | Fruit Flies Treatment | Drain Fly & Fruit Fly Eliminator (1 Gallon)
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It is important to note that these gels do not contain insecticides. The best way to get rid of drain flies is by implementing proper sanitation and cleaning out breeding sources (which is where drain gels help!).

InVade Bio Drain Gel

Invade Bio Drain smells amazing. It also uses an advanced probiotic and microbial formula to eat away organic buildup. The citrus oil helps mask any light-to-medium odors that might be present in your drain.

Invade Bio Drain Gel for Drain Flies

The gel really clings to drain walls to allow the probiotics to digest organic material. A gallon jug contains up to 33 treatments.

Pros: Well priced, high viscosity gel pours easily and smells great. It also works!

Cons: If you do not like citrus scented products, this might not work for you.

InVade Bio Drain Hot Spot Foam

Rockwell labs knew it had a hit on its hands with their drain gel. They followed with a foaming aerosol with the same formula.

Hot Spot Foam provides more application options for hard-to-reach areas. As a Green Zone certified product, Hot Shot Foam is suitable for green service programs as well. It contains the same natural microbes to digest organic matter.

Invade Hot Spot Foam Drain Cleaner

You can also use this product to mask odors in in garbage cans, litter boxes and other areas.

After a treatment, the foam will dissipate completely in about two hours. This treatment can work well in sump pits.

Pros: Versatile foam-based high quality InVade technology formula.

Cons: Pricey, a 16 oz can will cost you roughly $22.

American Bio-Systems DrainGel

Concentrated bacterial formula containing over 750 billion colony forming units per gallon. What this means: this gel will easily digest grease and organic material buildup.

American Bio-Systems Blue Drain Gel 1 Gallon Jug

American Bio-Systems states that their drain gel will do what hot water, bleach and chemical cleaners can’t. Their product is also NFS registered for use in food processing facilities.

It will take about 4-5 days for DrainGel to eliminate the drain fly breeding ground.

It is also possible to use DrainGel as a foam without reducing effectiveness.

Pros: A powerful, no frills drain gel suitable for residential and commercial use.

Cons: Expensive at almost $48 per gallon.

Lawson Drummond DF5000

Drain Fly 5000 is a mint scented drain cleaner designed to dissolve buildup. Like other gels, DF5000 contains a blend of bacteria and enzymes. The gel is extra-heavy to ensure a good coat.

DF5000 Drain Gel in 32 oz bottle

Pros: Pro-grade drain cleaner breaks down gelatinous buildup in drains where flies breed.

Cons: Sold in 32 ounce bottles, only 8 treatments per bottle.

Valtec Bio-Action Total Solution Gel

Valtec is a lesser known brand among the webs forums, stores and DIYers. This might be due to the way they choose to market their drain maintenance products.

Total Solutions Valtec Bio-Action Drain Gel

Drain flies thrive in areas where drain buildup is common, such as in showers and the kitchen. Bio-Action treats the source and goes as step further. Regular use creates an active bacteria population. This allows the product to work proactively and prevent future issues.

Pros: Formula contains spore form bacteria for enhanced stability. Stacked defensive benefits with regular use. Well priced.

Cons: Smallest order amount from the manufacturer is 6 pints.

Pest Peeve Bye Bye Drain Flies

This is an interesting one.

The branding definitely aligns with a business-to-consumer approach (those who may not normally be into getting their hands dirty). This grape scented (right?!) gel claims to treat drain flies. Like several other brands, they back performance with a “pest-free guarantee”.

Bye Bye Drain Flies gel from Pest Peeve

This is most likely a white label product, but the scent is definitely unique.

Pros: Performance guarantee.

Cons: Very expensive for a gallon jug; product safety data sheet not available.

Green Gobbler Drain Fly Goodbye

The unique additive in this gel is the citronella oil and Sodium Lauryl Sulfate (1-5%). In theory, the scent of this oil would repel certain flying insects.

best drain fruit fly killer from Green Gobbler

Try their Enzyme Drain Cleaner which does the exact same thing for $10 less!

Pros: Well priced; 30 day guarantee.

Cons: Might be worth using their “Enzyme Drain Cleaner” product to save money.


If you are comfortable with getting only 3 uses out of your product, Forid might be for you.

Forid Organic Drain Cleaner for Drain Flies

The product works well when used as instructed, but you may need to buy many bottles. (They are 64 oz each!)

A unique feature is the built in measuring cup. It is also 100% organic.

Pros: Built-in measuring cup; 100% organic.

Cons: Three uses for $37 may not get you very far, prepare to spend big money.


Why is Drano listed with organic drain gels?

Because many people want to know if it will work! (It will.)

Drano Gel gel for flies

Drano is a low cost, DIY solution for clearing blockages. This caustic liquid can kill drain flies, but it won’t eliminate the gelatinous buildup where they breed.

If the breeding ground is not removed, eggs will hatch and the cycle will continue.

Yes, Drano can kill adults, larva and pupa with prolonged contact.

Is it a good standalone solution to stop them from coming back? No.


The truth is, Rid X is not specifically meant for drain fly infestations. The formula or powder helps treat septic system issues.

rid x kill drain flies?

Testing out this cheaper alternative to other drain fly gels might be worth it. No promises though.

Pros: Low cost, might work to remove organic buildup, good if you have a septic system

Cons: Not marketed to specifically remove drain fly infestations

The Best Way to Get Rid of Drain Flies

Let’s make this simple. The fastest way to kill drain flies is to:

  1. Identify where they are breeding
  2. Remove their breeding ground
  3. Kill adults with aerosol spray

It is important to be proactive to prevent future buildup and infestations.

Drain gel is often called the best drain fly killer available. In reality, it is also very important to scrub the drain with a pipe brush and practice good sanitation. This will help ensure a complete removal of any buildup and prevention in the future.

If there is hair buildup in the pipe, make sure to remove it using a snake or drain auger before using a natural drain gel.

Last update on 2024-06-12 / Affiliate links / Images from Amazon Product Advertising API