Potassium Metabisulfite

Potassium Metabisulfite

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Potassium Metabisulfite, (often referred to as "SO2", "sulfites" "meta", or "meta-bi") has several uses in winemaking. At the crush, sulfites are generally used to help control the spoilage bacteria and indigenous yeast that may already be present both on the fruit and in the winery (i.e. on the picking bins, processing equipment, tanks, tubing, etc).

The amount generally used is enough to inhibit most of the unwanted organisms but not enough to hinder a cultured yeast, which has a higher tolerance to sulfites than most of the indigenous organisms do. This inhibition effectively "wipes the slate clean" for the cultured yeast to step in and rapidly colonize the must so that it can effectively dominate the subsequent fermentation.

In addition, sulfites also help to inhibit the enzymatic browning of both musts and finished wines so that all of their delicate complexities can be preserved. Later, during storage and in the bottle, sulfites at the proper levels will further protect a wine by continuing to inhibit spoilage organisms, as well as by scavenging oxygen.

Note that the exact amount needed to effectively do the job is determined by the pH of the wine. Refer to our MoreManuals! on Red or White Winemaking or one of the winemaking books that we offer for a complete explanation on how to properly manage sulfites.

In addition, it's important to keep in mind that free SO2 levels fall faster in wood cooperage than in glass or stainless, so if you are using a barrel you will most likely need to manage sulfite levels more closely.

The most common form of Metabisulfite is as a powder which is fixed with potassium or sodium. 1/4 tsp of Potassium Metabisulfite adds 50ppm to 5 gallons of must. Old Metabisulfite loses potency with time and should be replaced every year to assure that you are getting correct levels. You can use old Metabisulfite to make solutions for sanitizing equipment.

Community Q&A

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Browse 2 questions Browse 2 questions and 56 answers
Why did you choose this?
MoreFlavor Store
Good price
Paul S on Jul 2, 2020
Manage O2 in bottles
Benjamin B on Jun 13, 2020
Good price
Paul S on Jul 2, 2020
Used at beginning of process
Dee A on Jun 29, 2020
Manage O2 in bottles
Benjamin B on Jun 13, 2020
Cause Wine
Jakob P on May 27, 2020
Ran out
Steve J on May 21, 2020
to remove chloramine from water for my garden
Shane O on May 18, 2020
Perfect for adjsuting my water profile!
david o on May 17, 2020
we own a small winery
can't make wine without it.
GARY B on Apr 23, 2020
Edith Gustason on Apr 22, 2020
need it
Brian Christopher B on Apr 21, 2020
stop the fermentation
Robert W on Apr 15, 2020
hay preservative
Justin P on Apr 14, 2020
Want to see how it works in reducing cold side (keg) oxidation
Daryle S on Apr 9, 2020
need it
Robert J G on Apr 4, 2020
To sanitize fruit prior to fermentation in melomels
Diki S on Mar 21, 2020
I was out
Frederick Carbone on Mar 2, 2020
Protect wine while aging and sanitize equipment
JOSHUA TAYLOR on Feb 29, 2020
Kether S on Feb 25, 2020
i wanted it
jesse n on Feb 21, 2020
Add before bottling wine
Anthony T on Feb 20, 2020
reasonable price for the quantity
Tracey l H on Feb 19, 2020
Need for winemaking process
Valued C on Jan 1, 2020
need it
Gregory W on Dec 27, 2019
jeremiah g on Dec 23, 2019
brewing beer
Anthony K on Dec 16, 2019
Barrel maintenance
Mark G on Dec 10, 2019
Use regularly
Valued C on Nov 30, 2019
I have tried the tablets and they don't dissolve well.
Adam B on Nov 28, 2019
Wine protection
Colby Bullock on Nov 18, 2019
Wine making
Robert M on Nov 15, 2019
Barry W on Nov 11, 2019
You know why!!!
Jim Wallace on Nov 6, 2019
Was running low .
Jennifer Lee S on Oct 16, 2019
Bryan C on Oct 10, 2019
Alton S on Oct 1, 2019
Recommended by The Home Winemaking Channel
Charles P on Sep 30, 2019
Making hard cider
Todd C on Sep 24, 2019
it's great after showers for managing foot fungus
Thomas S on Sep 23, 2019
Ease of use
Danny L T on Sep 22, 2019
I use this product
Jerry J W on Sep 21, 2019
easy to use
Arnie Wetzstein on Sep 18, 2019
Need more
Kenneth B on Sep 17, 2019
nicola m on Sep 13, 2019
Recommeded by Home winemaking Channel
James P on Sep 9, 2019
good for sanitizing naturally
CANZADA W. on Sep 9, 2019
Bob Sugermeyer on Sep 9, 2019
Use it last year
Travis B on Sep 5, 2019
CRAIG J on Sep 5, 2019
Must have
Victor C on Sep 4, 2019
Used at beginning of process
Dee A on Jun 29, 2020
Cause Wine
Jakob P on May 27, 2020
Packaging - Does this product come in resealable packaging to keep it fresh?
Luigi Carleo on Apr 9, 2020
BEST ANSWER: Hi Luigi - Unfortunately, the bag this comes in is not resealable.

4.6 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I have been purchasing this item in the 5 pound bags for a number of years. I have found it beneficial and economical to purchase it this way as it will usually usually last us for the entire annual wine season. Easy to purchase and quick delivery.
July 1, 2020
2 weeks ago
Works as it should!
I do really like this product it is always of good quality.
January 13, 2020
6 months ago
It was necessary for the wine I was making! It was great that you carried it!!
January 3, 2020
6 months ago
Potassium meta
Good stuff works great.
October 4, 2019
9 months ago
It has worked as expected
September 17, 2019
10 months ago
Potassium Meta Bisulfate is old and too weak
For the last move years of wine making KMETA has always burned my nose when I try to smell a sanitizing solution of it. Now and once before a few years ago I received this product and it was not fresh and strong. When mixed as a sanitizer (3 tablespoons per gallon of water) it had no more sulphate knock-you-back smell than plain water.
A couple weeks ago I asked for a replacement of my October order of KMETA and received it promptly... it was no fresher than the original batch.
I believe there must be a quality control issue.
Now I know why my recently S02 treated wines are growing mold in the carboy.
January 9, 2019
1 year ago
Response from MoreFlavor
Hey so sorry about your experience. Thank you so much for your feedback. We really appreciate the honesty and value great feedback like this as it helps us improve our products. We try very hard to create the best experience for our customers and provide quality products. Please give us a call at 1-800-600-0033 or email us at info@moreflavor.com so that we can assist you. We are here to help. Cheers!
May 27, 2020
Malcolm MB
Everything as stated
October 6, 2018
over 2 years ago
very fast shipping
Very fast shipping, Excellent response and communication to my question, excellent product
May 25, 2018
over 2 years ago
This was accidentally left off my shipment and MoreBeer quickly rectified the issue! Great customer service!
April 2, 2018
over 2 years ago
Potassium MB
if you buy a bag of potassium MB get a designated plastic sealable container to store it in. Open it away from your face because the fumes are strong.
February 10, 2018
over 2 years ago