Pre boil gravity vs starting (post boil gravity) and beersmith.

[crawkraut]

Beersmith indicates preboil gravity in my recipe to be 1.128 and post boil starting gravity to be 1.070. What I don't get is how can the gravity decline from preboil to post boil. It's counter intuitive to me, shouldn't it be the other way around?

 

[stpug]

Top up water would cause a higher preboil than OG (OG would be in the fermenter at full volume as opposed to postboil which would be at the end of boil). If you only boil half your batch and top up then preboil would be significantly higher than OG. Could this be the case?

 

[crawkraut]

Your response makes sense thank you but there's no top up in this one. Boiled the whole batch. And now post boil gravity is higher than pre boil gravity. Gettin ready to move it to primary after wort chiller finishes its duty.

 

[crawkraut]

I'm doin the pre boil reading after I've collected all my run off. Maybe beersmith is doing the reading before the sparge water comes into play.

 

[Qhrumphf]

You may have your equipment set to partial boil extract batches. I'd check your equipment settings. If equipment is set right, I've found BeerSmith to be incredibly accurate.