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Old 06-12-2014, 04:03 PM   #11
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Originally Posted by delarob View Post
On full boils don't forget to account for lossage after the boil etc.. So if the final result would be to actually get 6 gallons, I would not boil down to 6 because you will lose a bit more in transfers and may end up at around 5 or a little above when it comes time to keg/bottle.
Different ways to look at this. You'll lose volume to trub and you'll lose volume to yeast no matter how you do it. Whether that's trub left in the kettle and yeast in the fermenter, or transferring it all to the fermenter and leaving it all there depends on the brewer.

I target 5 gallons post-boil, and transfer it all, trub included, to the fermenter, and usually end up with 4.5ish gallons bottled.

Whether the trub is good or bad in the fermenter is a different debate.
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Old 06-12-2014, 04:15 PM   #12
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I always keep an unopened jug or two of filtered spring water handy in case I boil off too much. Sometimes I underestimate my boil-off. It also has the added benefit of helping chill the wort, as I keep this reserve top-up water in the back of my fridge.

Just a side note when topping up, make sure you top up until you hit your desired OG, not your volume volume. Otherwise, you may end up with water beer.

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Old 06-12-2014, 04:23 PM   #13
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Just a side note when topping up, make sure you top up until you hit your desired OG, not your volume volume. Otherwise, you may end up with water beer.
For extract recipes you should just top up to the final volume of the recipe. The amount of sugar in the extract is constant. So if the recipe is for 6 gallons and you add all the extract and end up with 6 gallons you're pretty much guaranteed to have just about the right OG.

It's different for all grain because your efficiency can be variable.
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Old 06-12-2014, 04:29 PM   #14
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For extract recipes you should just top up to the final volume of the recipe. The amount of sugar in the extract is constant. So if the recipe is for 6 gallons and you add all the extract and end up with 6 gallons you're pretty much guaranteed to have just about the right OG.
Theoretically yes. But maybe you didn't get all the extract syrup out of the can. Maybe you had a couple bad boilovers and lost some wort. Maybe the volume measurements on your Ale Pail aren't accurate. Whatever the case, it's always best to measure what you are doing, rather than blindly add water and hope for the best. Hitting your OG/FG numbers is always more important than making sure you get exactly 53.3 bottles of beer in the end, imho.

But yeah, with extract brewing, it's a bit harder to screw it up. With AG, you damn sure better measure.
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Old 06-12-2014, 04:42 PM   #15
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Theoretically yes. But maybe you didn't get all the extract syrup out of the can. Maybe you had a couple bad boilovers and lost some wort. Maybe the volume measurements on your Ale Pail aren't accurate. Whatever the case, it's always best to measure what you are doing, rather than blindly add water and hope for the best. Hitting your OG/FG numbers is always more important than making sure you get exactly 53.3 bottles of beer in the end, imho.

But yeah, with extract brewing, it's a bit harder to screw it up. With AG, you damn sure better measure.
I would unequivocally argue against doing that. Water plus wort equals unreliable reading. So its still a guessing game.

Instead, measure volume (accurately - make your own volume marks) and take a reading before you top off. Then calcuate the water needed to dilute down. Exact same math use for preboil gravity when doing full boils, just done in reverse.

Voila. Guesswork 100% eliminated.
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Old 06-12-2014, 04:49 PM   #16
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I would unequivocally argue against doing that. Water plus wort equals unreliable reading. So its still a guessing game.

Instead, measure volume (accurately - make your own volume marks) and take a reading before you top off. Then calcuate the water needed to dilute down. Exact same math use for preboil gravity when doing full boils, just done in reverse.

Voila. Guesswork 100% eliminated.
I think we're saying the same thing, only differently. All I am saying is only add the amount of water it takes to hit your SG number, not your volume.
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Old 06-12-2014, 04:56 PM   #17
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I think we're saying the same thing, only differently. All I am saying is only add the amount of water it takes to hit your SG number, not your volume.
Just reread. Guess I read something between the lines that wasn't actually there.

Thought you were advocating measuring as you topped off. Which is a bad plan. You can calculate exact gravity at one volume if you know exact gravity at another volume, so you can determine mathematically exactly how much water to add, and only need that first measurement.

But it seems we're on the same page anyway.

I agree with topping up to OG and not to volume. But with extract beers, unless there's an issue (like noted above) your gravity should always be accurate at the right volume.
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Old 06-12-2014, 05:14 PM   #18
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Looking at my post, I guess it was pretty vague/open to interpretation.

The specific methods you outlined are much more helpful than what I posted.

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