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Old 02-07-2013, 11:21 PM   #1
LazySumo
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Default Marbles as a Mash Filter

Has anyone ever tried using a bed of marbles in the bottom of the MT as a filtration? Any guesses on how well it might/might not work?

There was a thread here a few weeks back where someone had a SS screen in the bottom of a MLT but the screen was several inches off the bottom and a suggestion came up to fill that space with marbles. My idea just sort of came out of that.

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Old 02-07-2013, 11:39 PM   #2
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I can think of much worse ideas. Try it.

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Old 02-07-2013, 11:40 PM   #3
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Sounds to me like it would work, depending on how deep the bed of marbles is the grain should settle into it and filter as normal.

You would have to fly sparge.

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Old 02-07-2013, 11:41 PM   #4
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In theory it would seem to work. I guess as long as the marbles are small enough.

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Old 02-07-2013, 11:42 PM   #5
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Your actual filtration will be done by the grainbed itself, but this could be useful to hoist the grain bed of the bottom of your MLT if that's useful to you for some reason. Seems like a reasonable cheap alternative to a false bottom. Let us know how it works.

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Old 02-08-2013, 12:20 AM   #6
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Huge mess to clean up. A couple years ago I made strawberry infused vodka. The jar had a spigot and I used marbles to avoid the berries clogging it. When finished they were a nightmare to clean and avoid going into the disposal. Careful!

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Old 02-08-2013, 03:12 AM   #7
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If I were to try this (brew session coming up in 2 weeks) how would I judge it's effectiveness? Obviously a stuck sparge would be bad. What about efficiency? Low specific gravity of the wort pre-boil would be bad, I think. What else?

Tupperwulf, why couldn't I batch sparge this? Why the fly process?

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Old 02-08-2013, 10:50 AM   #8
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Are you worried at all about even one of the marbles shattering in the heat? That's the only thing Id be worried about.

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Old 02-08-2013, 12:01 PM   #9
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Quote:
Originally Posted by LazySumo View Post
If I were to try this (brew session coming up in 2 weeks) how would I judge it's effectiveness? Obviously a stuck sparge would be bad. What about efficiency? Low specific gravity of the wort pre-boil would be bad, I think. What else?

Tupperwulf, why couldn't I batch sparge this? Why the fly process?
If you stir the mash up for a batch sparge, you would also stir up the marbles. They should certainly settle out first because they are heavier than the grain but you will get grain mixed in.
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Old 02-08-2013, 12:05 PM   #10
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Then only potential problem is that marbles aren't made under food safe guidelines and they may have nasty stuff in them. Old marbles or foreign-made cheap marbles may have lead in them.

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