- Choose the sulphite source by selecting potassium
metabisulphite, sodium metabisulphite, or sodium bisulphite
from the drop-down list. Most winemakers use potassium
metabisulphite for additions to wine, but other sulphite
forms are often used in sanitizing solutions. If you are
using campden tablets, check the ingredients, then select
the sulphite source from the drop-down list.
- Sulphite is available either in powder or tablet form.
In addition, many winemakers prepare a sulphite solution by
dissolving powder in water (see the resources section for information
regarding the preparation of sulphite solutions). Click on
the sulphite form that you are using. If you are using a
solution, you also need to specify the strength of the
solution as a percentage (1 to 100). A 10% solution is very
common to use. If you are using tablets, you need to
specify the tablet weight in grams. This weight should be
printed on the package.
- Set your batch size and specify the measurement units.
You can choose either, U.S. gallons, imperial gallons, or
litres as measurement units.
- Set the pH or your wine. Setting the pH is only
required if you have chosen "Molecular SO2" as the target.
If the target is set to "Total Free SO2", the program will
ignore the pH data.
- You can select either total free SO2 or molecular SO2
as the target. If total free SO2 is selected, the program
will calculate how much sulphite is required in order to
reach a specified total free SO2 level. If molecular SO2 is
selected as the target, the program will calculate how much
sulphite is required in order to reach a specified
molecular SO2 level. If molecular SO2 is chosen as the
target, the wine pH must also be entered in the batch data
- Molecular SO2 is the active SO2 component that protects
your wine from spoilage. You should choose this target to
be sure that your wine is protected. See the resources page for recommended
molecular SO2 levels.
- Enter the existing total free SO2 level of your wine.
This is a measured amount that is found by titration.
Titrets are commonly used by home winemakers for this
- Enter the desired target SO2 level. If free SO2 is
selected as the target, the first field will be used. If
molecular SO2 is selected as the target, the second field
will receive the input data.
- Numbers can be entered using 2 methods. Numbers can be
typed directly into the text fields. This method has a
greater level of precision because the text fields will
accept decimal numbers as input. Numbers can also be
entered by using the up/down arrows beside each text entry
field. These arrows will increment/decrement the
- Once all the settings have been specified, the sulphite
required to reach the designated target level is calculated
by pressing the Calculate button. The program will
then validate the input data. The program will display a
message if any of the data is unacceptable. If all data is
within acceptable parameters, the required addition fields
will display the amount of sulphite required to reach the
- If powder is chosen as the sulphite form, the amount of
powder required can be specified in g, oz (av.), tsp, or
tbsp by choosing the desired units from the dropdown
list. If a solution is specified, the amount can specified
in ml, oz (fl), tsp, or tbsp. If tablets is chosen,
the amount shown is the number of tablets.
- Most winemakers will use many of the same settings
every time the program is used. If your desired settings
differ from the program defaults, personal defaults can be
set by clicking the Settings button. After selecting
the desired defaults, click OK. The personal
settings have been saved and will appear next time the
program is run.
- The program defaults can be restored by clicking the
Restore Program Defaults button in the settings
- Help information is maintained on the program web site
rather than in the software itself. This ensures that the
information can be updated as needed, without releasing an
upgrade to the software. General information regarding the
use of sulphite in winemaking can be found on the resources page.
- The feedback page can be
used to contact the author if further help or information
- The author is always interested in hearing about bugs
and ideas for possible enhancements to the software. The
current version has no known bugs, but if any bugs are
discovered, report them through the feedback page. Bug fixes will be
released as soon as possible after discovery.
Copyright © 2001-2013 www.fermsoft.com