diy glass marbles filter media - The Planted Tank Forum
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post #1 of 21 (permalink) Old 06-02-2016, 04:05 PM Thread Starter
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diy glass marbles filter media

take a glass marbles (amount that fit your filter)

now take sandpaper the coarser the better
you sand the marble until you feel the rougher wash them
and put in the media section in the filter

they will be heavy so watch out
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post #2 of 21 (permalink) Old 06-02-2016, 04:17 PM
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Any idea how effective this would be compared to a variety of other filter media options? Why marbles?
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post #3 of 21 (permalink) Old 06-02-2016, 04:20 PM Thread Starter
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you make them vary porous and large surface area

because they most common (at least here)
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post #4 of 21 (permalink) Old 06-02-2016, 04:39 PM
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Very porous? You get just some pores on the surface, normal biomedia has deep pores through all volume...


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post #5 of 21 (permalink) Old 06-02-2016, 04:43 PM
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Nylon pot scrubbers, for example, are dirt cheap and offer crazy amounts of space to colonize if you're looking for cheap, DIY filtration media.

As near as I can figure, the marbles would be 99% solid glass, with a slight colonization of the scratched up surface. Has anyone tested out what this actually allows for bio filtration in comparison to a similar sized sponge layer for example? (I would presume even a coarse, rinseable sponge would offer significantly more bio colonization than the marbles, cost less, not require sanding, and it's easy to rinse/re-use, and works as mechanical filtration on top of that)

I guess I'm missing why marbles.

(although I am looking to use marbles for some valves I want to design, I don't think they're well suited for filtration media)
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post #6 of 21 (permalink) Old 06-02-2016, 11:13 PM
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You'd have much better results using lava rocks than those marbles. You can buy enough to fill a 10 gallon aquarium at a hardware store for under $10.
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post #7 of 21 (permalink) Old 06-02-2016, 11:48 PM
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diy glass marbles filter media

I use these. Kinda pricey but do there job very well


http://m.drsfostersmith.com/product/...FZaEaQodOOEGbw


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post #8 of 21 (permalink) Old 06-03-2016, 12:40 AM
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Lava rock...... Cheap and porous


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post #9 of 21 (permalink) Old 06-03-2016, 12:41 AM
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The smaller the particle size the larger the surface area / mass. Say one of those marbles had a mass 1.27g and a surface area of 6.4 square cm. When broken down to infinite pieces you would gain surface area without gaining mass. Once you reach a point (smallest) the media will no longer filter properly.

If you want to use marbles I would suggest soaking them in a caustic solution, drain-o for several days, high pH will etch glass

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Last edited by MCSLABS; 06-03-2016 at 01:00 AM. Reason: grammar
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post #10 of 21 (permalink) Old 06-04-2016, 10:13 PM
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Lay each marble on a concrete floor. Hit with a hammer, breaking them up into small pieces. Result: much more surface area, with most of it not polished. Also, reduces bottled up stress, and is cheaper than tranquilizers.
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post #11 of 21 (permalink) Old 06-04-2016, 11:15 PM
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Originally Posted by Hoppy View Post
Lay each marble on a concrete floor. Hit with a hammer, breaking them up into small pieces. Result: much more surface area, with most of it not polished. Also, reduces bottled up stress, and is cheaper than tranquilizers.

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post #12 of 21 (permalink) Old 06-09-2016, 12:57 AM
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Why not just throw in a hand full of gravel. It would be more effective than marbles, cost less and you don't have to do any sanding. Bio media is all about surface area and even water flow. Lava rock makes pretty lousy bio media but would be many, many more times efficient than marbles. If you break them up that would effectively give you more surface (still a fraction of what a decent media would get you) but you won't get even flow through it and will end up with pieces packed together.
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post #13 of 21 (permalink) Old 06-09-2016, 01:00 AM
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Originally Posted by alcimedes View Post
Nylon pot scrubbers, for example, are dirt cheap and offer crazy amounts of space to colonize if you're looking for cheap, DIY filtration media.
I like this idea. Which kind would you use, the ones that are like a round thing made out of net, or the ones that are kind of flat and thin?
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post #14 of 21 (permalink) Old 06-09-2016, 01:02 AM
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Originally Posted by Hoppy View Post
Lay each marble on a concrete floor. Hit with a hammer, breaking them up into small pieces. Result: much more surface area, with most of it not polished. Also, reduces bottled up stress, and is cheaper than tranquilizers.
Lol
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post #15 of 21 (permalink) Old 06-09-2016, 01:31 PM
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I like this idea. Which kind would you use, the ones that are like a round thing made out of net, or the ones that are kind of flat and thin?
The round, hair net looking kind. Some folks over at MFK at one point had done the math on various materials and their surface area. Nylon pot scrubbers were second only to the specialized clay material sold by various filter manf. that's super expensive.

Pot scrubbers were the next best option, and at 1/10th the cost. I ordered them from some bulk supplier when they went on sale, $50 was enough to fill 40g of sump.

The only downside, (or maybe upside) is that my sump looks like a unicorn threw up in it.

edit: Here's the thread. It's worth a read if you've never seen it before, some non-intuitive results (I thought).

http://www.monsterfishkeepers.com/fo...r-media.88677/

If it's not OK to cross link to another forum I can remove it, but this is just really solid data.
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