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2 micron airstone/ aerating wort

Post #1 made 10 years ago
by onkeltuka
So I got this 2 micron steel airstone, but I started thinking is it enough of a filter by itself? Bacteria can be down to 0.5 microns in size. My plan was to drive room air through it with an aquarium pump, but now I'm not sure. They also sell those 0.5 micron stones, but what are they for? Somewhere I read that o.5 microns is for pure oxygen, and 2 microns for normal air? Why is this so?
"The rules for making hop additions during the boil are about as well defined as those for a knife fight." -Stan Hieronymus

Post #2 made 10 years ago
by Lumpy5oh
The stone is not there to act as a filter but to change the air into tiny bubbles that can be better absorbed by the wort. I have not used one yet but from what I understand you really need to boil the stone before use to kill anything that could be living in the pores.
Some people are like slinkies. Not good for much, but bring a smile to your face when pushed down the stairs.

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Post #3 made 10 years ago
by onkeltuka
ok. So if I'm going to use it to pump air with a pump then I'll need a filter of some sort as well?
"The rules for making hop additions during the boil are about as well defined as those for a knife fight." -Stan Hieronymus

Post #4 made 10 years ago
by mally
I have no experience of this whatsoever, but I would guess you need an inline-hepa filter.

something like this?
Last edited by mally on 25 Mar 2015, 16:11, edited 1 time in total.
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Post #5 made 10 years ago
by Lumpy5oh
I have no experience with these either but I would think that there would not be much more chance of getting an infection than from shaking your carboy or aggressively agitating the wort. The pores of the stone could easily harbor nasties in between uses.
Hopefully someone with experience can straighten us out.
Some people are like slinkies. Not good for much, but bring a smile to your face when pushed down the stairs.

Weehoosebrewing.ga
    • SVA Brewer With Over 20 Brews From Canada

Post #6 made 10 years ago
by PistolPatch
[Off-topic: Just reading your signatures above. There are some crackers there :)]

Just waiting to go and taste some 'Tusk' with sinkas at Clancy's (local pub) so this might be the last and only sensible post from me today :). I'm no expert on this are so can only offer a few thoughts...

1. Don't be scared of air if you will be pitching straight away. Pouring from a height (splashing), rocking the fermentor and using an airstone are all pumping 'dirty' air through your wort but you will rarely find a problem unless you are doing it outside in wild yeast conditions.

2. Someone posted about six months ago here that rocking the fermentor will actually aerate your wort faster than an airstone. I didn't know that but thought it was a great thread (anyone remember the link?).

3. Personally, I have the 2 micron airstone which I do boil in water. I have a hepafilter on it and have used the same one for years but I wouldn't be worried if you don't have one given 1 above. Despite now knowing about 2 above, I prefer the filter instead of rocking as I don't like the idea of the underneath of my fermentor lid and the seal etc, etc, being washed in wort that will never see yeast. That is me proabbly being pedantic though.

:scratch: :think:

...

Have no idea on the 0.5 micron thing for O2 and the 2 micron for CO2 sorry onke.
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Post #8 made 10 years ago
by thughes
I aerate with pure oxygen, not sure if it's better than regular air but after sitting in a NC cube for several weeks I like to give the wort the best possible chance of becoming beer.

---Todd
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