How much of this do you need and how often? How long will one bottle last?

I used about a cup per drain, the instructions says to use about 4 ounces that is half a cup. One bottle lasted about 4 applications for me because i used more but if you follow the instructions it should yield 8 aplications per drain. Check the pictures i posted in my review for more details. I used it for 2 days straight and it took care of the problem.

Can this product be used directly and effectively in toilets

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.

How long should it sit in sink before running the water?

I let it sit overnight. At a minimum several hours. Stuff works!!

Is it safe for septic tanks?

Don't know don't have septic tank

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🚿 Clean drains, clear conscience — the future of eco-friendly drain care!

RAPID RELIEF - Advanced enzymes and emulsifiers deliver fast, effective drain cleaning.
ODOR OBLITERATOR - Eliminates stubborn drain odors, leaving freshness behind without harsh scents.
MICROBIAL MASTERY - Harnesses a potent Bacillus blend to naturally break down organic waste.
ECO SMART SOLUTION - Non-toxic, biodegradable formula safe for your home and the planet.
USER FRIENDLY DESIGN - Convenient flip-top quart bottle for precise, mess-free application.

American Bio-Systems DrainGel™ is a concentrated, non-toxic drain cleaner featuring a stabilized blend of enzymes, emulsifiers, and viable Bacillus bacteria. Available in quart and gallon sizes with an easy-application flip-top cap, it rapidly removes organic waste and odors from drains while being safe for the environment and your home.

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