You need to figure out what ppm that equals to & raise the dosage according to the chart:
For every 100 gallons
5 ppm ----- 1892 mg VC
10 ppm ---- 3785 mg VC
15 ppm ---- 5677 mg VC
20 ppm ---- 7570 mg VC
25 ppm ---- 9462 mg VC
30 ppm ---- 11355 mg VC
I used pure, buffered, sodium ascorbate (although magnesium or calcium ascorbate will do also), purchased from
www.i-herb.com. 1/4tsp=1112mg