Zep 18oz Drain Cleaner

This should be the only way to keep drains clean. Chemical drain cleaners are toxic and can damage pipes. Then it gets flushed down to the sewage treatment plant where it takes a lot to be removed. Think about it. Cleaning drains with this product uses ENZYMES. THIS WORKS!!! Is crazy inexpensive and gets rid of sink flies and bad smells.

No amount of cleaners or bleach could get rid of the smell coming from our bathroom drain. Couple doses of this stuff and it’s good as new. Highly recommended!

As renters (who used to be homeowners), we noticed the drain of the kitchen in the house we are renting was emitting an unpleasant smell-- not like sewage, but something like old food-laden dish water. None of the solutions we tried worked, and meanwhile the kitchen was starting to smell pretty embarrassing, despite the sink draining normally. After doing some homework, we decided to try this enzyme cleaner. A scoop wasn't included in the bottle but we googled this, and found 1 scoop is approx 5 teaspoons, so we mixed 5 teaspoons into 2 cups of warm water to follow the instructions. After 3 nights of this treatment, the drain issue is solved. It seems to have improved the outcome of dishwasher use too, even though we didn't directly treat the dishwasher (the dishwasher drains into the same pipe as the kitchen drain). We'll do maintenance treatments as recommended. Just relieved this odor issue is resolved.

It did not kill drain flies like I expected,but maybe the drain is clean.

I bought this after having to snake out a clog of black slime from my main drain. I wanted to clear the line of any remaining slime, so I mixed 4 scoops of this with 4 pints (½ gallon) of warm water, and poured in the kitchen cleanout port (highest point in drain system). After 8 hour, I filled the kitchen sink with about 7 gallons of hot water, removed the drain plug, and less than 10 seconds later the water had emptied! Note that to find the scoop, you may need to fish around in the powder to find it, as they tend to bury it, as others have also noted.