Here is a link that I found that provides some good information regarding Mermax.
I found these measurements for Fermax on the page listed above.
What is a proper dose of DAP and Fermax™ for a wine?
The answer largely depends upon the source and quality of your juice. In general, if you press your own grapes or buy fresh or frozen juice from a vineyard, your doses will be higher than if you make your wine from a wine kit.
If making wine from fresh or frozen juice (not processed - just straight grape juice), here are the recommended doses of DAP and Fermax™:
- 1 gram DAP / liter
- 1 gram Fermax™ / US gallon
If making wine from a wine kit*, the proper doses would be:
- 0.2 to 0.4 grams DAP / liter
- 0.1 to 0.2 grams Fermax™ / US gallon
For example, let's say you have 6 US gallons of fresh grape juice from your backyard that you want to make into wine. Based on the chart above, your recommended doses would be calculated like this:
1 US gallon = 3.79 liters, so 6 gallons = 22.71 liters
Total DAP dose: 22.71 grams
Total Fermax™: 6 grams
Following our dosage recipe, we would add:
- 11.35 grams of DAP and 2 grams of Fermax™ before adding yeast
- 11.35 grams of DAP and 2 grams of Fermax™ once fermentation starts
- 2 grams of Fermax™ at 12-8° Brix