So I tried a bigger grain bill in the Guten unit, 6.6 kilo, I have downloaded the Grainfather instructions but decided I would make a thinner mash, dead space in the Guten is 2.5 litres, using the calcs for the Grainfather 2.7 x 6.6 + 2.5 (3.5 on GF) =20.32 but filled up to 25 litre mark, mashed in and could see the first problem, I was only just under the overflow pipe, wasn't keen on liquor going down the overflow so stuck a piece of silicon hose into the top of the overflow pipe being careful to keep the height of the hose under the malt pipe lifting holes.
This worked so all the mash liquor is draining through the grain bed, second problem I wanted to give the grain a stir, paused the op but as soon as I went to take of the top mesh some husks came out. Decided to give that a miss and carried on, end of the mash sparged with 9 litres of water, giving me a roughley 28 litre boil volume pre boil gravity came in at 1.052 predicted using a 70% efficiency was 1.051 gave a 1 hour boil no chilled ended up with just under 24 litres in fermetor overshot again, am going to have to make a measuring stick, 2litres of trub left in the unit and OG came in at 1.062 predicted 1.063.
So efficiency is nothing to worry about, the other thing I was concerned about was residual sugar coating the bottom of the unit, I had read with the Grainfather to keep scraping the bottom of the unit to prevent any build up but when emptied found everything to be sound, easier to clean than the BM so happy with the purchase.
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Clear wort
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Trub
