carniebrew
Brewvy baby, brewvy!
- Joined
- 26/11/12
- Messages
- 1,868
- Reaction score
- 614
Any new yeast will only be able to eat any fermentables left in the wort. i.e. you could pitch 2 packs on 23 litres, or you could pitch 5 packs on 23 litres, and they would likely end up with the same final gravity. The taste may differ due to the by-products produced by yeast that have been over-pitched, but it won't affect gravity (i.e. dryness).
I suggest you do a forced ferment test on your wort. Take a ~250ml sample into a jar (make sure everything is sanitary as per usual, you don't want infection to mess the results here), keep it somewhere warm and shake the crap out of it as often as you can. After 24 hours of this, check the gravity of this sample. If it hasn't changed, then there's no fermentables left in the wort. If the gravity has dropped, then you need to either rouse the existing yeast in your main fermenter, or add more yeast.
I suggest you do a forced ferment test on your wort. Take a ~250ml sample into a jar (make sure everything is sanitary as per usual, you don't want infection to mess the results here), keep it somewhere warm and shake the crap out of it as often as you can. After 24 hours of this, check the gravity of this sample. If it hasn't changed, then there's no fermentables left in the wort. If the gravity has dropped, then you need to either rouse the existing yeast in your main fermenter, or add more yeast.