K
KernelCrush
Been reading about getting the correct levels & sources of zinc.
One I read the guy said he uses collected rainwater to brew with and his roof is galvanized, so he is good.
Others suggest a piece of zinc plated hardware in the boil...evidently some German brewers have done this.
Then I found this exacting method. From what I read it appears you don't want to exceed 0.6ppm
Zinc Solutions
Two common sources of zinc are Zinc Chloride (ZnCl2) and Zinc Sulphate that normally has water attached to it (ZnSO4.7H20). This hydrated ZnSO4 is still a crystal, it just absorbs water from the atmosphere. You can get these from school labs or lab suppliers.
In these examples we are looking at adding 0.4ppm of zinc to the final wort.
ZnCl2
Make a solution of 4.17g ZnCl2 (dry) per litre of de-ionised or distilled water.
This solution contains 2mg of Zinc per mL.
So for 20L wort you add 4ml to get 0.4 ppm Zn in the wort
ZnSO4.7H20
Make a solution of 35 grams of ZnSO4 per litre of deionised or distilled water.
This solution contains 8 mg of zinc per mL.
So for 20L wort you add 1ml to get 0.4 ppm Zn in the wort
Looks like a small quantity of ZnSO4.7H20 will get you a lifetime supply in a mason jar.
One I read the guy said he uses collected rainwater to brew with and his roof is galvanized, so he is good.
Others suggest a piece of zinc plated hardware in the boil...evidently some German brewers have done this.
Then I found this exacting method. From what I read it appears you don't want to exceed 0.6ppm
Zinc Solutions
Two common sources of zinc are Zinc Chloride (ZnCl2) and Zinc Sulphate that normally has water attached to it (ZnSO4.7H20). This hydrated ZnSO4 is still a crystal, it just absorbs water from the atmosphere. You can get these from school labs or lab suppliers.
In these examples we are looking at adding 0.4ppm of zinc to the final wort.
ZnCl2
Make a solution of 4.17g ZnCl2 (dry) per litre of de-ionised or distilled water.
This solution contains 2mg of Zinc per mL.
So for 20L wort you add 4ml to get 0.4 ppm Zn in the wort
ZnSO4.7H20
Make a solution of 35 grams of ZnSO4 per litre of deionised or distilled water.
This solution contains 8 mg of zinc per mL.
So for 20L wort you add 1ml to get 0.4 ppm Zn in the wort
Looks like a small quantity of ZnSO4.7H20 will get you a lifetime supply in a mason jar.