Drain Gel

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Average Rating

4 out of 5 stars Rating: 3.8

41 Reviews | 11 Q&A

Product Overview

Get rid of drain flies fast with Drain Gel drain fly treatment. Drain Gel is a concentrated biological product specifically designed to treat organic matter build-up in sinks, drains and garbage disposals where drain flies harbor and reproduce. Each quart treats approximately two drains.

Treating drain fly problems with ordinary drain cleaners, hot water, detergents, bleach, or ammonia is ineffective. The most effective solution is the use of a highly concentrated biological product with specially selected bacteria strains. Drain Gel’s new formula contains MGD (Microbial Grease Degrader), a unique Bacillus strain that breaks down complex grease molecules. American Bio-Systems Drain Gel is highly concentrated and can be used directly in drains or in non-drain areas such as sinks, drain grates, and floors.

See our entire selection of drain fly control products

Product Documents

Features and Specs

Shipping Weight 2.34 lbs
Manufacturer American Bio-Systems
UPC 727908744972


How Drain Gel Works

DrainGel's formulation incorporates specialized microorganisms in combination with biological support ingredients and essential growth factors. This unique formulation promotes improved performance in degradation of organic materials. The unique bacillus bacteria strain MGD (Microbial Grease Degrader) immediately multiplies and starts digesting organic waste upon application, breaking down long chain fatty acids, the primary component of problem grease. Drain Gel controls foul odors by inhibiting the normal biological production of odor-causing compounds such as hydrogen sulfide and rancid fatty acids that result from septic or anaerobic environments.

Target Pests

Organic buildup in drains that is the breeding site for odors, drain flies and fruit flies

PESTS CONTROLLED WITH DRAIN GEL: Odors, surface and drain scum, organic buildup

Target Uses of Drain Gel

Drain Gel removes hard to reach organic matter from drains where drain flies breed. This specially formulated product is made to cling to the inside of drains and pipes so that it may continue working for several hours instead of just draining away like other products. Drain Gel will also get rid of rank odors from drains and improve flow in slow drains. Drain Gel is safe for all types of plumbing and is non-toxic, non-pathogenic and non-caustic so you can use it with peace of mind.

ACTIVE INGREDIENT: Natural bacteria

Drain Gel Application Instructions

PREPARATION: If drain is not regularly used, moisten drain by pouring 1-2 gallons of warm water into drain. For all applications, apply product at time of lowest drain use, ideally at end of day after the use of all cleaning and sanitation products has been completed.

START UP: Add four ounces to each drain in area. Apply around edge of drain, attempting to coat sides of drain. Repeat dosage daily as necessary, usually for 5-7 days.

FOR MAINTENANCE: Apply four ounces per drain every one to two weeks.

*Always read the product label completely before use.

Each quart (32 oz.) bottle yields 8 drain treatments. Each gallon (128 oz.) yields 32 drain treatments.

Standard Application Rates:

*Apply 4 oz. per drain per application

Drain Gel is for use in the following areas:

No use site restrictions. Intended for use in drains and similar surfaces in kitchens where organic buildup occurs.


For non-drain areas: Remove loose and heavy surface organic matter from area before application. Spray area liberally until wet. Repeat application daily as necessary until organic material has been removed, usually for 5-7 days. Do not fog into air or apply to air moving equipment that may atomize product. For maintenance, spray area every one to two weeks, adjusting frequency based on results.


Drain Gel is not intended for outdoor use.

Drain Gel Features

  • Pleasant herbal fragrance
  • Salmonella and Shigella free
  • Safe for all types of plumbing
  • Removes hard to reach organic material from drain lines and non-drain areas
  • Reduces noxious drain odors and improves flow in slow drains
  • Designed to cling to the sides of drains and pipes
  • Can be sprayed onto hard-to-access non-drain areas
  • Biodegradable, non-toxic, non-caustic and non-pathogenic
  • High concentration of active bacteria: minimum 550 billion cells per gallon
  • Safe for septic systems

Extra Tips for Using Drain Gel

  • When applying in a drain with a garbage disposal, turn on the disposal for a few seconds to distribute the gel throughout the drain.
  • Do not flush with water after application.
  • Drain Gel is not a direct insecticide or a substitute for general sanitation.
  • Not for use in aquariums

Compare to: DF5000 Drain Gel, InVade Bio Drain

Review Search   
Sort Reviews
  • 5 of 5 Stars

    Great results!

    By Carrie on 01/13/2007

    Had fruit flies for 5 months that I could NOT get rid of. I used Drain Gel once and overnight the flies were gone, just like that. The directions on the bottle say to use up to two weeks for best results, and I probably should have kept using it for safe measure, but one night worth of this stuff in all our drains took care of the problem. I haven't seen a single fly for 3 months.

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    32 of 32 people found this review helpful

  • 5 of 5 Stars

    Worked great!

    By Jon on 07/28/2008

    Great stuff. Works like a charm. I ordered the Drain Gel to treat problems with drain flies at my home and it worked great!

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    29 of 30 people found this review helpful

  • 5 of 5 Stars

    Drain-gel: Worked for me

    By R on 05/02/2010

    Had drain fly problem in my apartment for several months. Used sticky strips (collected lots of flies), used bleach in drains (had no effect) covered all drains when not in use, still had flies (no idea how they got past the covers). In desperation, decided to try this stuff. Put about one cup down kitchen and bathroom drains for two nights. No more flies. It's been almost two weeks now, still no flies.

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    25 of 26 people found this review helpful

  • 3 of 5 Stars

    It worked but

    By Susan on 09/13/2008

    I ordered the Drain Gel and used it in all my drains for 5 days, just like the directions say to do. They were completely gone until about 4 weeks later, the moth flies were back. I would look for something that gets rid of them and keeps them away for longer than 1 month.

    Expert ResponseExpert response:
    In some environments such as restaurant kitchens where heavy and constant food prep is done, re-infestation may be inevitable. In these cases, the product label recommends to use 4 oz of drain gel every 2-3 weeks to maintain control.

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    24 of 27 people found this review helpful

  • 5 of 5 Stars

    Drain gel works!!

    By John on 07/08/2012

    Verified Purchase

    We had a real problem with drain flies at our home in Arkansas. It is our vacation home and it was a real chore to deal with these pests each time we arrived. I found Drain Gel online and gave it a try. It worked like magic and all the flies are gone. It is a relief to have a product on hand if the problem starts up in the future.

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    20 of 20 people found this review helpful

See all 41 customer reviews

Questions & Answers

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Sort Questions
Will Drain Gel help eliminate roaches coming up the drain, or should I use a roach pesticide?

I'm on a septic system also. Can Roaches live in septic tanks and then make their way up the drains?


No, Drain Gel will not treat plumbing lines for roaches. It is designed to treat the organic matter that builds up in your drains over time that leads to drain flies. Roaches can live in a septic tank, and can come up through the plumbing lines and make their way through the drains. However, you would not be able to use an insecticide in the actual drains. There is a product called Gentrol Aerosol IGR that is an insect growth regulator that stops the reproductive cycle in roaches that can be used in drains. Keep in mind, too, that roaches often just fall into or crawl in sinks because of the water there and do not actually come up through the drains. Please take a few moments to review our Roach Treatment Guide for more tips.

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9 of 10 people found this answer helpful

Does this product also help with the drainage flow in the drain? Mine have gotten slow. Thanks!
Yes, Drain Gel in addition to aiding in the elimination of drain flies, improves drain flow, leaving behind a fresh scent and preventing costly blockages.

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7 of 7 people found this answer helpful

Does Drain Gel work in the toilet bowl?

I have drain flies hatching in the toilet bowl. I see the instructions call for coating the sides of the drain to eliminate buildups of grease, etc. How do you apply Drain Gel in the toilet bowl?

You will usually see drain flies developing in a toilet only if the toilet is not used very often. Drain Gel probably won't be the best product to use in your situation. You can turn the water off to the toilet and flush it so that the bowl and the tank are empty. Thoroughly scrub both, paying special attention to the area under the lip of the bowl and the tank. Scrubbing and cleaning these areas will help eliminate the decaying organic matter that these flies need to breed and develop in. While the toilet is drained you can apply Invade Hot Shot Foam to the tank and the bowl and let it sit overnight to clean all of the cracks and crevices that you may not be able to clean properly. Invade Hot Shot would be a good choice because it will expand to cover all of the surfaces you need to treat. This may need to be repeated a few times before you get rid of all of the gunk that can build up over time. All drains in the infested room should be treated with either Invade Hot Shot or with Drain Gel.

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7 of 8 people found this answer helpful

Is drain gel ok for septic systems?
Yes, Drain Gel is perfectly safe for septic systems.

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7 of 7 people found this answer helpful

How does the Drain Gel product differ from DF5000?
Drain Gel and DF5000 are essentially the same product, they are just made by different manufacturers.

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6 of 6 people found this answer helpful

See all 11 customer questions

Drain Gel 4 out of 5 stars Rating: 3.8 (41 Reviews / 11 Q&A)

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