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 57 answers
Why did you choose this?
MoreFlavor Store
Keep my mead fresh
Valued C on May 12, 2021
Because it’s packaged in foil to help it stay fresh
Lyle P on Mar 29, 2021
Keep my mead fresh
Valued C on May 12, 2021
because I need it
Doug Van W on May 10, 2021
Because it’s packaged in foil to help it stay fresh
Lyle P on Mar 29, 2021
Dan D on Mar 26, 2021
Recommended by experienced wine maker.
Dean M on Mar 24, 2021
treating brewing water for chlorine/chloramine
Jacob H on Mar 19, 2021
We use in balsamic vinegars
Ivonne G on Mar 10, 2021
To sanitize my must
Michael S on Feb 23, 2021
Kai C S on Feb 11, 2021
I need to clean my bottles.
junor on Jan 22, 2021
Commercial WInemaking
John R on Jan 16, 2021
I need this to make my hard meyer lemonade
Duane H on Jan 14, 2021
back sweetening my cider
Mark S on Jan 14, 2021
Wine making
Andrew L on Jan 12, 2021
running low
Chris G on Jan 1, 2021
stabilizing agent
Galexior on Dec 23, 2020
Use to protect home made wines in long term storage
john w n on Dec 16, 2020
Vincent D on Dec 9, 2020
backup supply
Thomas R J on Dec 4, 2020
seems good
Tim L on Dec 4, 2020
for wine making
Katalin B on Nov 28, 2020
I need some
John Yale on Nov 28, 2020
S02 management and barrel storage solution
David B on Nov 20, 2020
For wine aging
Don N on Nov 16, 2020
better price per pound
Shirley H on Nov 14, 2020
To halt fermentation so I can back sweeten
Hayden B on Nov 11, 2020
I need to add sulfite to the wine before bottling. Why else would you buy this?
Daniel Ashburn on Nov 5, 2020
Use this all the time in the winery
David F on Oct 31, 2020
We use it i Wine making
Thomas C on Oct 29, 2020
To make mead
Casey S on Oct 27, 2020
Please print "Sample" on the shipping label .
TAKESHI H on Oct 20, 2020
stabilizer and sanitizer for hard apple cider
GLENN C. K on Oct 20, 2020
Gotta protect that wine!!!
James R S on Oct 14, 2020
It's best to go into harvest with fresh chemicals
Scott D on Oct 14, 2020
Will Keep from spoiling
Barbara I on Oct 14, 2020
Windmill Ginger B on Oct 13, 2020
Trying a cider for the first time
Robert G on Oct 13, 2020
Gotta hit the wine with it!
Valued C on Oct 9, 2020
Not available in my local store
Larry M on Oct 8, 2020
I like to make a10% solution, very simple to do 75 gm/fifth
john l on Oct 8, 2020
Sulfite the wine
Luciano C on Oct 3, 2020
form mead making
Erick C on Oct 2, 2020
Essential for winemaking
Frederick W H on Sep 25, 2020
A must for the must
Mark B on Sep 25, 2020
Use to add sulfite to wine after fermentation and to use as sanitizer solution
Samuel K on Sep 22, 2020
Mr Paul C Y on Sep 22, 2020
I like my wine clean and a minimal amount of sulfite ensures that it will be
Kirk A on Sep 18, 2020
for back sweetening
Raymond P on Sep 16, 2020
standard meta
Charles P on Sep 16, 2020
because I need it
Doug Van W on May 10, 2021
Dan D on Mar 26, 2021
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.

4.7 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Not so good on Cheerios but works great in wine.
April 13, 2021
1 month ago
Rated 5 out of 5
Have not used yet,I have used in the past I think it works just fine.
January 20, 2021
4 months ago
Rated 5 out of 5
Use fresh meta every year
Use fresh Mets every year to get good results. Use last years as a sanitizer
September 27, 2020
8 months ago
Rated 5 out of 5
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
11 months ago
Rated 5 out of 5
Works as it should!
I do really like this product it is always of good quality.
January 13, 2020
1 year ago
Rated 5 out of 5
It was necessary for the wine I was making! It was great that you carried it!!
January 3, 2020
1 year ago
Rated 5 out of 5
Potassium meta
Good stuff works great.
October 4, 2019
1 year ago
Rated 5 out of 5
It has worked as expected
September 17, 2019
1 year ago
Rated 1 out of 5
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
over 2 years 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
Rated 5 out of 5
Everything as stated
October 6, 2018
over 3 years ago