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Under attenuation

http://thebrewingnetwork.com/forum/viewtopic.php?f=19&t=21050

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Under attenuation

Posted: Fri Jun 18, 2010 11:09 pm
by maggotbrain65
Hi folks,

i have been all grain brewing for over a year now and although the beers are turning out pretty tasty, I'm noticing that they seem to be finishing a touch 'sweet', but not cloying.
I normally use a liquid yeast strain and step up to a 2l starter. Fermentation temperature control is pretty good and I'm certainly leaving the beer ferment out. I haven't noticed my F.G's to be unusual so I wondered what steps I could take to dry out the beers a little (without resorting to reducing my grain bill and adding sugar). Mash temps? Larger yeast starters?

Thanks in Advance

Sandy

Re: Under attenuation

Posted: Sat Jun 19, 2010 3:44 am
by bigdan
A couple things to look at. Have you tried raising the temp a few degrees toward the end of fermentation? You can try lowering your mash temperature. Also look at your grain bill are you using alot of caramel malts? Those are the first things I would consider. I hope this helps.

Re: Under attenuation

Posted: Sat Jun 19, 2010 4:15 am
by bsegroves
Also be sure to aerate really well before you pitch your starter.

Re: Under attenuation

Posted: Sat Jun 19, 2010 5:07 am
by Fritz Eye
What sort of attenuation are you getting or final gravities?
You concern may be something else. On one of the recent Brew Strong shows, Jamil mention that he tasted 2 of Tasty's Belgian Pale Ales.
The one that finished at 1.009 was the sweeter one the one that finished at 1.014 was less malty.
Might be worth looking into.
Good luck.

Re: Under attenuation

Posted: Sat Jun 19, 2010 6:41 am
by BDawg
Have you checked your water? Sulfates affect hop presence, which also changes the perceived sweetness of the beer.

Also, have you checked the calibration of the thermometer you use during mashing? It might be a couple degrees high.

HTH-

Re: Under attenuation

Posted: Sat Jun 19, 2010 6:15 pm
by maggotbrain65
Thanks for the responses. All very helpful.

I think I'll re calibrate my thermometer first of all and perhaps take a few degrees off the mash temp to see if that changes much. As a percentage of the grain bill, I dont think that the cara malts are too high and my water profile seems fair.

However, I don't use much in the way of aeration. I've seen the following aquarium air pump online, but would it do the trick? How would i attach a filter to it?

http://tinyurl.com/3xflejc

Thanks again

Re: Under attenuation

Posted: Sat Jun 19, 2010 6:19 pm
by BDawg
You want to get something like this:
http://morebeer.com/view_product/16797/ ... ary_Filter

Re: Under attenuation

Posted: Sat Jun 19, 2010 6:24 pm
by maggotbrain65
Hey BDawg,

thanks for the quick reply!

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