Grainfather Small Grainbill

[Donny]

I read that the minimum grainbill for the GF is 4.5kg. Has anyone any experience with the micro pipe work?
I'm hoping to make a session lemon drop pale ale and my grain bill is only 4kg. Also any tips would be amazing. This will be my third brew in the GF and I'd like to hit my numbers this time. 

[CH]

 From their site.
4kgs is fine just less for sparge

What is the minimum grain bill I can brew with?

You can use smaller grain bills but you need to make adjustments to your water calculations if you are using a grain bill below 4.5 kg (10 lbs).

Please use our brewing calculators to work this out or the specific instructions in your manual for small grain bills.
We wouldn't advise going lower than 2.5 kg (5.5 lbs) of grain. The overflow pipework only goes down to a certain point. The top plate is designed to fit into the overflow inlet which sits on the overflow pipework. So, this means the top plate only goes down as far as the overflow pipework does. This means, with a smaller amount of grain (less than 4.5 kg/5.5 lbs) the top plate will sit a bit higher than the grain bed. You will need to fill it with more water until you see the water reach the top plate. Be sure to record this extra water amount and change your calculation as appropriate as you will need to reduce your sparge volume by this amount.

[Donny]

This is great, thanks. Simple fix