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Bottom line: its impossible for the gravity to decrease during boil. You only evaporate water, leaving an increasingly sugary solution. So there is an error with your preboil postboil or both gravity readings. Most common reasons for incorrect readings: Incomplete Mixings Failure to to a temperature adjustment Related to the second - Uncalibrated ...

If the trub is actually physically holding the hydrometer up, preventing it from moving down, then unambiguously: yes, the trub will render your hydrometer reading useless. If, on the other hand, the trub is suspended in the liquid, it is a mixed bag. Suspended solids will impact a hydrometer reading, but for brewers it is usually very minimal. The only ...