Double distilling with a 25 litre pot still

[heyhaychapman]

I am hoping one of you can help me. I have had a good look through all the forums here and the net in general for days but still can't find the answer I am looking for.

I am using a 25 litre electric pot still and have run about a dozen washes through. Now I want to try double distilling.

When I do a single run I usually collect 4 to 6 litres ranging from 60 thru to 15 ABV. If I have stripped an all fruit wash I might only have 4 litres of 35% ABV.

Can I double distill on just these 4 or 5 litres?
If I need to add water is there formula to calculate how much ?

I have a feints jar and when that gets up to 10 or 20 litres I know I can run that through no problem but can I double distill these smaller amounts as I go?

HHC