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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Why did you choose this?
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Was running low .
Jennifer Lee S on Oct 16, 2019
Alton S on Oct 1, 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
LarryW 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
Danny F on Sep 2, 2019
For treating my water
Matthew M on Aug 29, 2019
Part of the solution to fill my wine barrel and prevents
Rosario C on Aug 28, 2019
Have used it before.
David Stephens on Aug 28, 2019
Dean C on Aug 28, 2019
Making wine with this product combination for several years - good outcome.
Tania D on Jul 29, 2019
I'm halfway thru a bag.
Brian K on Jul 8, 2019
For stabilizing wines
Jerrod D F on May 17, 2019
Need to have some on hand
Mike Sullivan on May 13, 2019
I need some fresh stuff. I replace it at least once a year.
Karyl N on Apr 26, 2019
Great for sanitization.
Edith Gustason on Apr 23, 2019
to clean sanitize wine bottles and corks
Alexander m on Apr 23, 2019
history of good results
michael a on Apr 9, 2019
I operate a cider house/winery
Far From the Tree C on Apr 4, 2019
Judy P on Mar 24, 2019
Barrel Holding Solution
J S on Mar 21, 2019
To protect bottled mead
anthony dotta on Feb 15, 2019
Must sanitizing
Josh F on Feb 5, 2019
ran out
Marilyn P on Jan 26, 2019
Basic stuff, good deal
Greg Thomsen on Jan 12, 2019
My wine supply store moved, so I now buy from here exclusively
Ronald S on Jan 9, 2019
Great product to add to your wine
Gregory a m on Jan 7, 2019
5lb was back ordered
Brandon R on Dec 31, 2018
i'm tired of crushing campden tablets
Hobson H on Dec 10, 2018
Need to make a barrel storage solution.
Michael Hoccom on Dec 5, 2018
I used this product at the UC
Luciano M on Nov 25, 2018
For hard cider
scott s on Nov 17, 2018
Sulfites for mead
Jonathan L. on Nov 17, 2018
decrease spoilage
Steve W on Oct 26, 2018
For use when racking
John B on Oct 25, 2018
For Cider
Adam R F on Oct 25, 2018
Wine Barrel Storage
Zachary B on Oct 18, 2018
Sanitation must
Valued C on Oct 3, 2018
Bryan C on Oct 10, 2019
Recommended by The Home Winemaking Channel
Charles P on Sep 30, 2019

4.5 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Potassium meta
Good stuff works great.
October 4, 2019
3 weeks ago
It has worked as expected
September 17, 2019
1 month 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
12 months ago
Everything as stated
October 6, 2018
1 year ago
very fast shipping
Very fast shipping, Excellent response and communication to my question, excellent product
May 25, 2018
1 year ago
This was accidentally left off my shipment and MoreBeer quickly rectified the issue! Great customer service!
April 2, 2018
1 year 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
1 year ago
Meta use
What can I say, it's one of the backbones of winemaking. I'd rather have the K ions than the Na ions, and sure is easier working with than the old fashioned campden tablets. Also use it for cleaning and sterilizing as well as the occasional red wine stain which it removes completely.
January 27, 2018
1 year ago
Longer shelf life
Great to add to the wine kits to allow a longer bottle aging.
May 31, 2013
Works as advertised
Used it to stabilize my mead after fermentation had completed. After a year my mead tastes as good if not better than before. Price is good with free shipping it can't be beat.
May 21, 2013