I thought I'd have a go.
I made a 300ml starter with some 1.041 wort I had in the freezer from a previous brew, on day 3 I made it up to 1500ml
with some of the same wort, that was last night this morning it was looking good.

It's taken off much quicker and is more vigorous than other starters, another thing I notice is the colour is slightly darker
both in the original bottle and in the starter. Planning a brew on Friday, not sure I have enough head space in my fermenter
