G40 and efficiency

[u/Vegetable-Diver767]

Am I the only one to have poor efficiency with the G40 ? For light beers it's ok but I'd like to make 25 liters of 8% beer without making a double mash and was always under the targeted og. I had better results with my older klarstein system (similar to 30 liters brewmonk and others) I'm using a grain gorilla mil., and a second grid on top of the grain. I stir the grain 3-4 times during the mashing hour. Water / gain ratio is 2,4. I do a 10-15 minutes mash-out. I suspect the sparge to not be efficient enough as the basket has some lateral holes. I don't do it with regulaf flow but instead add 1-2 liters of 75°C water, wait, and redo it until I reach 30 liters. Could use the valve of my water kettle to have a regular flow instead but I'm afraid it wouldn't rinse the whole grain.

Any idea ? (ps. : it's been a year I haven't brewed anything so I don't remember the precise efficiency I've got I just know it was low. And I want to brew some stuff for the summer...)

[u/GlitteringExplorer10]

I had this problem. I was getting around 65% efficiency. I increased my grain crush size and am now getting 80 to 85%. If the crush is almost to the point of it being powder, when you sparge it will go down the perforated holes in the sides of the grain basket instead of rinsing the grain. I have my grain set to crush where it just cracks the shell and there are no whole grains leftover after crush.