An internal keg filtering system

You know when you want to move a keg, but you don’t want to stir up the sludge at the bottom;  Or if you want to take a keg to a BBQ or whatever, and you have to transfer it off into another keg to avoid bringing shame to your family name with glasses of haze beer?

Filtering kind of sucks.  It works, but it tends to oxidise the beer, introduce possibility of infection, and prevent any further positive maturation the beer might have otherwise had.  So this fixes at least two of those problems.

Get your filter

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Cut it into 3 slices – you’ll need just one – I used a 1mm angle grinder disc – a drop saw would probably work well also.

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Get some plastic – this is some perspex I had lying around – anything that silicone would stick to is fine.

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Drill an 8mm hole in one of the plastic bits.

Make a nice sandwich with a bunch of silicon.  Jam a length of bev tube in the hole and silicon that up too.  Leave to set for a few days.  Once it has set, I boiled mine in some water for a while to sanitise the whole thing.

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It [i]just so happens[/i] that the dip tube on a corny keg is the exact OD required for our kegging push-in connectors to fit perfectly.  A straight connector is shown, but I ended up with a right angle one since it fit in the bottom of the keg better.

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So, you have to remove the dip tube, slide it up so you can reach the end of it, and attach the connector and filter.  It may take a little stuffing around, but you should be able to get the filter to lie flat on the bottom of the keg.  Reassemble the keg post, and you’re good to go.  Fill with beer from the fermenter.

Here’s the end result.

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This was straight from the fermenter just yesterday – perfectly bright now, and the beer will actually improve over time, which is rather less likely to happen if I filtered it on the way to the keg.

So obviously this is a little silly, but it is a thing that works.  It has some disadvantage in as you can’t really fill the keg through the beer-in connector anymore, as you’d be putting sludge on the wrong side of the filter.  You could, in theory, fill from the gas end, but you’d probably want to tip the keg over to avoid it splashing up in there, and it is altogether kind of awkward.

And I guess the keg might blow a little sooner, but that’s no more beer than what you’d lose filtering it anyhow.

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