What you have to realise is that reducing the amount of water will put extra strain on the the pump. When the pump starts, the water level inside the malt pipe will rise. Outside the maltpipe the water level will fall. A difference in pressure will build up directly proportional to the...
I have a SBM 20. For me the sweet spot seems to be at 6kg of grain. To maximize my efficiency I do the following:
- I ad one ore two litres of water extra on top off the the 23 litres mentioned in the manual. In my experience this reduces the strain on the pump, and the wort will circulate...