SO2 and Fresh Crush

[sdelli]

Doing a crush of about 500lbs to 550 lbs of grapes this fall. Can someone tell me how you calculate the proper amount of kmeta to add to get around 20ppm? I hear this is around the correct dose to kill off wild yeast....

 

[ibglowin]

You need 50ppm at crush on average, not 20ppm.

0.33 grams KMETA per gallon of Must results in 50ppm. For 10 gallons of Must you would need 3.3 grams of powdered meta-bisulfite. If you do not have a gram scale, ½ teaspoon (level) is about 3.3 grams and adds 50ppm (“total”) to 10 gallons. To use: Dilute the sulfite powder in water or juice until the crystals are completely dissolved and thoroughly mix into the must.

 

[sdelli]

Thanks. I will monitor the crush and adjust per actual amount of must at that time... I do have a gram scale so should be a pretty easy to calculate.