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Thread: DIY Sponge filter

  1. #9
    SDCPs's Avatar
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    That might work, but its going to be pretty fragile when you clean it.

  2. #10
    dustin's Avatar
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    ok so here is what i did to make my filters, maybe after they are running for awhile they might get fragile but they seem pretty tough to me right now.

    Materials:
    sponges
    1/2" pvc pipe
    ------other materials
    aquarium safe silicon
    slate rock or other decor to hold sponge underwater
    ------optional materials
    pvc pipe cap

    Ok at the moment here is how i constructed it.







    I'll add more details later i got to go....

  3. #11
    Millipede's Avatar
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    wow! i wasnt expecting pvc pipe! pretty cool. are those cellulose sponges? you might want to get nylon sponges. im not sure though but i think the cellulose sponges are biodegradable so would begin to break down.... they look pretty shiny and sparkly so maybe they really are some kind of plastic based sponge

  4. #12
    dustin's Avatar
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    I have no idea what kind of sponge it is they were labled car wash, i did rinse them they still have sparkles I'm really not sure whether its cellulose or plastic label doesn't say, its ok if they do biodegrade a little, as long as its not rapid, and if it holds the bacterial colony for awhile. I'll keep everyone updated on how they work. This is the very first one i made, i think i"m going to tweak it a little to make it more functional.

    The problem i have now is how do i keep the sponge sumberged? I was thinking about siliconing the rock to the sponge but then i figured then it would be hard to wash the sponge. i also thought about cutting a hole all the way through the sponge, and cap one end of the pvc pipe, and attach the cap to the rock. Or maybe silicon the pvc right to the rock. Then I'd have to remove the airline and then i could slide off the sponge for washing. Hopefully i will get the silicon tomorrow.

    I've heard that eventually all sponges will biodegrade after being colonized with the bacteria for a certain amount of time after awhile. It takes a long time, but it eventually happens to all the sponges. From the link i read sometime more than 10 years

    http://aqualandpetsplus.com/Misc%20Sponge%20Filters.htm

    Material costs:
    sponges ($1/sponge, dollar store)
    1/2" pvc pipe ($0.97/5ft length)
    ------other materials
    aquarium safe silicon ($5-$7 estimate haven't bought it yet)
    slate rock or other decor to hold sponge underwater (free/or possibly charged if you buy it)
    ------optional materials
    pvc pipe cap (i have no idea at the moment)

    Here is the price turn out for the little sponge filter i made. 4x3x3inch

    1 sponge cut in half $0.50, whole sponge would have been $1, it was like 6x3x4
    6" of PVC pipe $0.10, not sure for a whole sponge so you could double it i guess
    total: $0.60

    Well that's about it, i mean DIY sponge filters do save you a considerable amount, if you go to the store and buy a premade one they cost about at least $5 but usually more. Even with the extras i plan to add to enhance its overall function it might come to a little over a dollar/filter.

    I'll experiment with all types of sponges and see whats best, this was just what was available. a cheaper alternative could have been big lots, i saw they had multipurpose sponges like 24 for a buck, though they were like kitchen sponges without the scrub pad, so id have to stack a few together but that could have been cheaper

  5. #13
    dustin's Avatar
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    just thought today i might be able to tie it to the rock with like fishing line or something too.

    Here it is temporarily being held to a rock with rubber bands. I heard they are safe for the aquarium, just that they might break underwater eventually.





    + $0.80/filter if you put an end cap on the pvc pipe

    You may want to look around, my mom was at tractor supply so that's where she got them, they might be cheaper at lowes, and they are about $0.20-$0.50 each on ebay. I might be able to do without them and use the cheaper solution. Use a flat marble and silicon it to the end of the pvc pipe. or some other object. Though the silicon might bump the price up a little too.

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