I use hersbrucker. When I make this Cooper's kit I boil about 2 lbs light liquid extract with 1 oz. hersbrucker pellets for 30 minutes. At flameout add the Cooper's kit, mix thoroughly, cool, top off with cool water to 5 gallons, mix, pitch yeast. I make this often in the summer, it brews fast (I brew outdoors in Texas) and tastes pretty good with a lime wedge in the heat.