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?
MoreFlavor Store
Please print "Sample" on the shipping label .
TAKESHI H on Oct 20, 2020
Gotta protect that wine!!!
James R S on Oct 14, 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
Running low, plus new season, new supplies.
Michael Bergstrom on Sep 10, 2020
To stabilize mead for back sweetening.
Susan M on Sep 4, 2020
making mead
Jeffrey R on Sep 3, 2020
Need it use it
Dawn A L on Sep 3, 2020
Best for maintaining a clean environment
FERNANDO A on Sep 3, 2020
i think it’s easy to use
joseph g on Aug 31, 2020
standard order
John J on Aug 27, 2020
I read that this needs to be replaced every year or so. It's time to replace what I have.
Jon D on Aug 26, 2020
free fast shipping
Marco V on Aug 26, 2020
I've used it before
David Stephens on Aug 26, 2020
Easy to use wine equipment sanitation
Ken J on Aug 25, 2020
used last year
Tony M P on Aug 23, 2020
for sanitizing
Christopher H on Aug 21, 2020
Running out
Krista H on Aug 20, 2020
I need it!!!!
Timi M on Aug 20, 2020
winemaker magazine
Adrienne E on Aug 13, 2020
Chris H on Aug 13, 2020
Cleaning and SO2 in the wine
John B on Aug 11, 2020
Tom B on Aug 1, 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
Super 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
stabilizer and sanitizer for hard apple cider
GLENN C. K on Oct 20, 2020
It's best to go into harvest with fresh chemicals
Scott D on Oct 14, 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
15 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
Use fresh meta every year
Use fresh Mets every year to get good results. Use last years as a sanitizer
September 27, 2020
1 month ago
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
4 months ago
Works as it should!
I do really like this product it is always of good quality.
January 13, 2020
9 months ago
It was necessary for the wine I was making! It was great that you carried it!!
January 3, 2020
10 months ago
Potassium meta
Good stuff works great.
October 4, 2019
1 year ago
It has worked as expected
September 17, 2019
1 year 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
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
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