goswell
Well-Known Member
I have a quirk in my brewing that has always bugged me so I thought I would see if anybody else has ever had this problem.
My problem is my post boil gravity is always two points low from what it should be per my pre-boil gravity. I know my water measurments are spot on because I created my measuring stick using water weight, so that is spot on.
Here's what I do on brew day.
Do the mash as anybody would. Once I'm done batch sparging I stir the kettle good and then take a small sample and put it in a glass to cool. After about 20 minutes I measure that sample with a refractometer which is usually real close to what I predicted given my 75% efficiency.
Then I go through the normal boil and cool the wort. When the wort gets to about 75f I take another sample and measure that with the same refractometer. That reading is always 2 points lower than what any software would say.
For example, a 6 gallon batch of 1.050 beer would have a pre-boil gravity of 1.042 per Beersmith. If I get that same 1.042 pre boil gravity on my system, the post boil gravity will be 1.048. Whatever it is, it's consistent because I'm always two points low. I've come to grips with it and just account for it but it drives me crazy that I can't figure it out.
My problem is my post boil gravity is always two points low from what it should be per my pre-boil gravity. I know my water measurments are spot on because I created my measuring stick using water weight, so that is spot on.
Here's what I do on brew day.
Do the mash as anybody would. Once I'm done batch sparging I stir the kettle good and then take a small sample and put it in a glass to cool. After about 20 minutes I measure that sample with a refractometer which is usually real close to what I predicted given my 75% efficiency.
Then I go through the normal boil and cool the wort. When the wort gets to about 75f I take another sample and measure that with the same refractometer. That reading is always 2 points lower than what any software would say.
For example, a 6 gallon batch of 1.050 beer would have a pre-boil gravity of 1.042 per Beersmith. If I get that same 1.042 pre boil gravity on my system, the post boil gravity will be 1.048. Whatever it is, it's consistent because I'm always two points low. I've come to grips with it and just account for it but it drives me crazy that I can't figure it out.