Why would my OG drop during the boil?

Banjoblue · Mar 16, 2019

I had a Brix reading of 11.1 before the boil and a Brix reading of 8.1 after the boil. I kept both samples and checked them again this morning. I didn’t mix them up and they were at the same temperature. The only difference I can see is that the pre boil was noticeably cloudier than post boil. See pics. This was a Timothy Taylor landlord clone in a robobrew. Only my second brew (the first was a disaster )

kelper · Mar 16, 2019

What were you measuring it with? A refractometer? A hydrometer?

Banjoblue · Mar 16, 2019

Both. Hydrometer have matching readings.

Sadfield · Mar 16, 2019

Wort stratification in the first sample.

simon12 · Mar 16, 2019

I found this with a leak in a plate chiller watering in down.

Banjoblue · Mar 16, 2019

No plate chiller and volume dropped as expected. Wort stratification! I hadn't heard of that! I took both samples from the tap at the bottom. And pre-boil just after sparring. That sounds like a decent explanation given that the sugars couldn't have gone anywhere.

Thank you.

Mungri · Mar 17, 2019

What @Sadfield says.
You need to give the wort a good stir after sparging to get a correct measurement.
First time I used my Grainfather I had a very low reading taking a sample from the top.

Banjoblue · Mar 17, 2019

Makes perfect sense to me.

Why would my OG drop during the boil?

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