On Jan 29, 10:04 pm, "jim" > wrote:

> (((original SG-1) * number of litres at SG)+((added SG-1) * number of litres at SG)) / total litres in fermenter at end)
> + 1
>
> so in the original example modified to use an added solution at an SG of 1.080:
>
> ((3.162 +0.2 )/28)+1
> FINAL SG 1.120
>
> Does that sound about right to you? It looks like it might be to me.

That is right by me. A slight modification is to use the original SG
without subtracting and then adding 1. Also, I always use the quantity
first, so:

25.5 L (1.124) + 2.5 L (1.080) / 28 L = 31,362 L / 28 L = 1.120

That was a good subject Jim

Guy