How do you aerate

gunner · Post by **gunner** » Sat Nov 07, 2009 2:01 pm

Once you have dropped the wort to FV for initial aeration,how would you go about aerating the wort again once inside the FV,for the first few days of fermentation,if you needed to.

Is it just a case of attaching a paddle to a drill.

vacant · Post by **vacant** » Sat Nov 07, 2009 2:14 pm

I've never done that.

If you're fermenting in one of those young's FVs with the screw on lid then the space above the wort in the container will probably be mostly CO2 so I reckon you'd just be stirring that back in.

gunner · Post by **gunner** » Sat Nov 07, 2009 2:21 pm

It was some advice chris gave me when using WLP O5,to aerate it for the first few days in the FV.I had a stuck ferment last time i used this yeast,the advice was to rouse everyday,and not a bad idea to aerate for the first few days.

Was just wondering how you would go about it.I ferment in a youngs vessel but just leave the lid slightly open.

6470zzy · Post by **6470zzy** » Sat Nov 07, 2009 3:24 pm

I use an aquarium air pump with a 2 micron stainless steel air stone attached, it works for me.

Cheers

Whorst · Post by **Whorst** » Sat Nov 07, 2009 4:03 pm

I've used WLP-05 a lot. I hit the wort with pure oxygen and I've never had it finish higher than 1.012. That's also without ever rousing it.

nobby · Post by **nobby** » Sat Nov 07, 2009 5:23 pm

gunner wrote:It was some advice chris gave me when using WLP O5,to aerate it for the first few days in the FV.I had a stuck ferment last time i used this yeast,the advice was to rouse everyday,and not a bad idea to aerate for the first few days.

Was just wondering how you would go about it.I ferment in a youngs vessel but just leave the lid slightly open.

Just give it a good stir with a wooden spoon or similar for a couple of minutes.. This will mix some of the yeast back in. Another way is to use a big jug and lift some wart out and pour it back in from a hight. Do this for a few minutes.

You dont need anything fancy like air pumps or Oxygen

WishboneBrewery · Post by **WishboneBrewery** » Sat Nov 07, 2009 5:32 pm

dropped from boiler through sieve into Bucket, thrashed with a brewers paddle

6470zzy · Post by **6470zzy** » Sat Nov 07, 2009 9:56 pm

nobby wrote: You dont need anything fancy like air pumps or Oxygen

Where's the fun in that then??

It's ALL about the gadgets

booldawg · Post by **booldawg** » Sun Nov 08, 2009 4:40 pm

I've never had a problem simply 'dropping in from height' The huge foamy head in the FV is testament to the amount of oxygen getting in the wort.

A drop of 3 feet or more does the job, this is of course easier in a HK plastics 'open lid' style FV rather than a screw top jobbie with the bubble breather.

Deebee · Post by **Deebee** » Tue Nov 10, 2009 9:00 am

Small sanitised paint mixer on cordless drill is cool. Also a hand mixer ( sanitized naturally!)

Parva · Post by **Parva** » Fri Nov 13, 2009 3:39 am

nobby wrote: Just give it a good stir with a wooden spoon or similar for a couple of minutes..

This is being pedantic and I shouldn't but feel that it should be pointed out. NEVER use wooden spoons in any part of the brewing process, plastic is fine but do not use wooden. Well ok, wooden prior to the boil would be ok but certainly not post-boil.

bosium · Post by **bosium** » Fri Nov 13, 2009 11:24 am

I've always just let the boiler drain into the FV from a height, and then given it a good shake after that, which has worked for me. I have, however, just invested in one of those little aquarium pump with a sterile filter on it to try and get some more air into the beer.

I always thought though, that you shouldn't introduce additional oxygen beyond this initial aeration as it can stale your beer!

adm · Post by **adm** » Fri Nov 13, 2009 11:56 am

It sounds as if you are talking about two different things....

A) To aerate when you first run into the FV - you can use the "drop from height" technique, a drill and paint mixer, a good stiff stir with a sanitised non-wooden spoon, a good shake of the the FV.....any technique you like really.....

B) After the first 12-24? hours, you really shouldn't aerate the wort AT ALL or you may end up oxidising the beer. You may want to gently "rouse" they yeast by stirring gently with a sanitised spoon if the fermentation is slow, but that's about it.

The yeast only needs extra oxygen for the first period of fermentation - I think this is normally complete within 12? hours or so for most brews. After that point, excess exposure to air is a BAD thing!

Scooby · Post by **Scooby** » Fri Nov 13, 2009 1:28 pm

If you look on the Wyeast web site there is a comparison of aeration methods, Pumping compressed air through a stone with a pump was found to be not as efficient as traditional splashing and thrashing.

8ppm oxygen was dissolved with 5mins pumping through a stone, the same amount was dissolved after 40secs of splashing and shaking. They concluded although labourious it was quite efficient.

They state 10ppm is considered adequate for most situations and a 1min injection of o2 measured 12ppm

I drop from a height from the boiler then go mad with a large balloon whisk until both arms are nearly dropping off, about 1min.

bosium · Post by **bosium** » Fri Nov 13, 2009 2:40 pm

I could be mistaken, but my understanding was that continuous aeration for 30 mins or more will actually result in more yeast growth than just shaking alone, as the yeast will actively be consuming the O2 while it is being injected over the 30 minute period in addition to the 8ppm O2 left in solution at the end of aeration. Dunno if that makes sense?

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