Today I did my first yeast starter. I purchased the 2000mL flask and DME from northernbrewer, and it came with instructions for doing both 1000mL and 2000mL batches. It suggests 1000mL for 5 gallons of wort with OG of up to 1.080.
For 1000mL, it says to put in 650mL of water and 1/2 cup DME.
For 2000mL, it says to put in 1300mL of water and 1 cup of DME.
So I meant to do a 1000mL starter but ended up putting a full cup in, so I added enough water to equate 1300mL.
I did have a boil over (!) which will disrupt this question, but I thought it was relatively small.
My final liquid wort volume was 800-850mL. After pitching in the liquid yeast, the final amount rose to 1000mL.
So my "2000mL" starter is now half the volume.
It is impossible that the boil over I had took out one half the volume.
However I did a strong boil which most definitely added to the loss from the evaporation.
1) Does it matter at all if a 2000mL starter ended up as 1000mL of liquid? As long as I have the full cup of DME, the total volume shouldn't matter, right?
2) If not, Is it best to do a very light boil instead of a rigorous boil, so that the final amount of liquid will be closer to the amount you started with?