Using Brewer's Yeast in a Septic System

Many homeowners with septic systems regularly add brewer's yeast to keep their system functioning properly. This is a guide about using brewer's yeast in a septic system.

May 28, 2005 Flag
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Brewer's yeast can be used in the toilet once a month, to keep your septic tank leach lines flowing. It keeps the bacteria active in your septic system. No need for harsh chemicals.

By Terri H.

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August 6, 20050 found this helpful

That stuff doesn't really help but it does not hurt the system. good information about septic tanks and treatmentat

good luck

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August 8, 20060 found this helpful

Roughly speaking, how much brewers yeast should you use per month, per year, etc.?

Editor's Note: Here is a great link for Septic Tank care:

It looks as though yeast is very helpful in tanks that are sitting, such as vacation home tanks but may not be as helpful for tanks that are being used all the time.

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July 10, 20080 found this helpful

If you don't want to use yeast, you should look at BioWorld Produst septic tank treatment. It has worked GREAT.

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January 22, 20090 found this helpful

According to this link-- -- additives aren't really as effective as we think they are. Either way... I don't see any harm in it. I've been using bakers yeast for my system.

And you should be able to get it at places like Whole Foods or baking supply stores.


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November 8, 2013 Flag
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How much brewer's yeast do you pour in and do you pour it in stool or septic tank?

By Kathy from Locust Grove, OK

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November 10, 20131 found this helpful

I've been in this house over 35 years and once a month I put one packet in the toilet

bowl and flush. In the beginning there were 6 kids and 2 adults, now only 2 and this house was built in 1949...(and no problems).

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